Look! there's B. Rabbit
"Oh you signed me up to battle? I'm a grown man!"

from Eminem – Just Lose It Lyrics on Rap Genius

Meaning

8 Mile reference:

In 8 Mile, B — Rabbit (Eminem) had a fight with his best friend Future — David Porter (Played by Mekhi Phiper) over a battling. Future signed him up on rap battle when he didnt want, beacuse shit was messed up at the time. B — Rabbit got a little angry. Here is full happening :

Jimmy Smith Jr: I don’t give a fuck, man. I’m sick of you always thinking you know what’s best for me, dawg. You ain’t my fucking father. I’m a grown man.

Future: Look, Jimmy…

Jimmy Smith Jr: Look, Jimmy, nothing! Fuck you! I told you not to fucking sign me up!

Future: So what the fuck, you wanna fight me now, huh?

Jimmy Smith Jr: Yo you ain’t the future of shit, bitch! You’re just David fuckin' Porter.

Sol: Hey, come on, fellas.

[long pause]

Future: You know what? Do what the fuck you wanna do man. ‘Cause I don’t give a shit anymore. I really fuckin’ don’t!

[Future walks away]

Future: I really fuckin' don’t!

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