Justin Bieber:
Look what the cat dragged back from the dead!
(This is an alteration of the phrase, "Look what the cat dragged in," which means meeting someone you dislike. The phrase is changed due to Beethoven being dead.)
Man, it looks like Chewbacca wiped his ass on your head!
(Chewbacca is a Star Wars character who has woolly hair similar to Beethoven's. Bieber says that Beethoven's head looks like it has some of Chewbacca's posterior hair left on it.)
I'm the next Michael Jackson! You smell like Betty White!
(Michael Jackson became a celebrity as a 5-year-old, and he was very successful as a solo singer until his death in 2009. Similarly, Bieber was a celebrity at around the age of 12 when he was picked up by Usher after he found him singing on a YouTube video. Bieber claims to be the next King of Pop like Michael Jackson. He also compares Beethoven to actress Betty White, whose career spanned over 80 years. He is calling Beethoven old news.)
Here's some aspirin: You're catching Bieber Fever tonight!
("Bieber Fever" describes a worldwide phenomenon that occurred during Bieber's stardom from 2009 - 2014 where fans (often female and dubbed "beliebers"), would flock to Bieber at public events or otherwise have an obsession with him, similar to "Beatlemania". Critics of Bieber during this time were often in their 20s to 30s (thusly born in the 1980s - 1970s), and had likely grew to hate Bieber due to the repetition and rate his songs were being played during "Bieber Fever". Bieber calls Beethoven "old" and states that if he doesn't take asprin, which is a medicine used to treat common illnesses, he will become a fan of him.)
Because my voice is incredible and your music is terrible,
(Bieber thinks that his vocal talent is superior to Beethoven's compositions.)
Who even listens to classical anyway?
(Classical music is not considered to be mainstream.)
Even Elise wants to do me, and now that you're right next to me,
(One of Beethoven's most popular works, "Für Elise", was likely written for one of his piano students, Elise (though the most widely believed dedicatee was Therese Malfatti, whose name may have been accidentally transcribed from "Therese" to "Elise"), to whom Beethoven had proposed, but was turned down, and she instead married Wilhelm von Droßdik, an Austrian nobleman and state official. Bieber says that while she rejected Beethoven, she would probably prefer to be with Bieber due to his appeal among younger girls. Also, while Beethoven is close to him, Bieber notices something about him that is stated in the next line.)
I can understand why they used a dog to play you in the movies!
(Bieber alludes to the Beethoven family comedy films featuring a Saint Bernard named after the composer. Bieber implies that Beethoven looks similar to a dog, which is why the dog is named after him.)
Ludwig van Beethoven:
Sit down, son, and let me give you a music lesson!
(Beethoven says that Bieber doesn't know how to make music, so he'll show him how a real musician plays.)
Ask Bach: I've got more cock than Smith and Wesson!
(Johann Sebastian Bach is another famous classical composer whose music Beethoven had studied. Smith & Wesson is a manufacturer of firearms, and guns are cocked before shooting. He says his dick has more "cock" than a cocked gun, believing that even other historical figures in music would be aware of his large manhood.)
Never say never? You'll never be forgetting!
(Beethoven says that the title of Bieber's song, "Never Say Never", is wrong because Bieber will never forget him after this battle.)
I crafted masterpieces that will last throughout the ages!
(Beethoven is considered one of the greatest composers of all time. He claims that his music will always be remembered, while Bieber's songs will be eventually forgotten.)
Your music gets you bitches on your Facebook pages!
(Beethoven states that in contrast to his timeless legacy, Bieber will only be known for the overly obsessive fans who have run fan pages. Many Bieber fans are known to be crazy for his music and have occasionally done many over-the-top or ridiculous things in places such as Facebook.)
I'm committing verbal murder in the major third degree!
(Double entendre: a major third is a musical interval, and here, it's put together with a third-degree murder, which means a murder that resulted from indifference or negligence. Beethoven states that he'll kill Bieber using his raps without even trying.)
My name is Beethoven, motherfucker! Maybe you've heard of me!
(Beethoven sarcastically mentions how well-known he is.)
Not the Saint Bernard version; I'm the real O.G.!
(O.G. means "Original Gangster". Beethoven reminds Bieber that he's the real deal, since the dog from the Beethoven films Bieber mentioned earlier was only named after him.)
You wanna trade blows? You can't even hit puberty!
(Trading blows means throwing punches or fighting. Bieber had a voice that, at the time, was higher and more feminine than an average male at his age; therefore, since he could not figuratively hit puberty, he wouldn't be able to do so physically. In other words, Beethoven taunts Bieber for trying to fight when he can't even "hit" puberty.)
Justin Bieber:
I've got Kim Kardashian in my bed backstage.
(Bieber says he can get any hot girl he wants, even the famous model/actress Kim Kardashian. He once tweeted as a joke that Kardashian was his girlfriend and sent a photo of them.)
When's the last time your music got anybody laid?
(Bieber claims that just his music can attract girls to have sex with him. In contrast, he states that Beethoven's music can't get him laid with anyone.)
I've got a concert in five, so there's not much time left.
(Bieber frequently gives concerts for his large female fanbase. He says that he has no more time to battle since he has a concert starting in a few minutes.)
What else can I say? Your own music made you deaf!
(Despite his masterpieces, Beethoven became deaf later in his life and was unable to hear them. Bieber implies that Beethoven's music is so bad, he made himself go deaf from hearing it.)
Ludwig van Beethoven:
I would smack you, but in Germany, we don't hit little girls,
(Like most people who dislike Bieber, Beethoven wants to smack him. His reason not to is because of being a German composer, and that Germans never hit girls. Bieber is often called effeminate by people who dislike his music because of how feminine his voice sounds and how baby-faced he appears to be.)
And I'm glad I'm deaf, so I can't hear that piece of shit, My World!
(My World was Justin Bieber's first ever EP, which was supplemented by his debut studio album My World 2.0. Beethoven refers to Bieber's last line by saying that he'd rather be deaf than listen to Bieber's terrible music.)
There's a crowd of millions waiting to hear my symphonies!
(There are still many people who enjoy listening to Beethoven's music.)
You wanna be a little white Usher? Here, show them to their seats!
(Usher is a singer who found Bieber and made him a famous pop star. An usher is also someone who shows people to their seats in a theater. He says that Bieber wants to copy Usher's talent, so at the end of the video, he turns him into an usher and tells him to show the crowd to their seats for Beethoven's concert.)