And if you fuck around I'mma put you in the trunk

from Logic – As I Am Lyrics on Rap Genius

Meaning

He is randomly getting serious and saying that if you fuck around, he’s gonna kill you and put you in his trunk (typical of Mafia/organized crime and street gangs, to put dead bodies in their trunks until they find a better place to put it).

We can see here an inspiration from Slim Shady, as he has already done references in other verses like “Untouchable from Drizzy Wright:

Ayo, whose arm is this?
I guess Slim cut it off at the pharmacist

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