Ass muscle

The muscle in the butt used as in insult towards someone acting dumb.

Person1:Hey wanna get some beer?
Person2:You're old enough to drink?!
Person1:I'm23 ass muscle.

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No Muscle Ass Bitch

Somebody whose incapable of building muscle.
A cunt that's trashing everybody online and is a skinny piece of shit.

Fuck you, you no muscle ass bitch!