ACTING sloppy/floored/trashed after a few drinks, generally to gain attention or try to seem cool. This often results in your bro's getting pissed.
Guy 1: Dude is Jay fucked up? We've been here for an hour.
Guy 2: Na dude, he's cuttin' up so hard. I watch that bitch have 3 beers and that's it.
Guy 1: Fuck him dude, we're not bringing him anymore. He's embarrassing as shit.
2) He went to wash some clothes at the washers and girl his clothes was cuttin' up!
( While at the laundromat when he exposed his clothes they smelt horrible.)
3) That Nigga's feet was cuttin up!!!
(His feet stank)
To behave like a clown or jokester (a cut-up); to misbehave; to act in a playful, comical, boisterous, or unruly manner to elicit laughter, attention, etc.