Green’s Dictionary of Slang

booty adj.

[? fig. use of booty n.2 (3) as a negative in the same way as arse n. is used]
(US black/W.I./UK black teen)

1. weak.

[US]College Sl. Research Project (Cal. State Poly. Uni., Pomona) [Internet] Booty (adj.) 1. Corny. 2. Weak.

2. second-rate, inferior.

[US]LL Cool J ‘It Gets No Rougher’ [lyrics] The competition is booty, get the picture now?
[US]Big Daddy Kane ‘Down the Line’ [lyrics] But your rhymes are so booty you should write ’em on White Cloud.
[US]Tribe Called Quest ‘Scenario’ [lyrics] our booty rhymes are wack and that’s the reason I ain’t hearin ya.
[US]GangStarr ‘Takea Rest’ [lyrics] I won’t let a booty-ass rapper get wins against me.
Online Sl. Dict. [Internet] booty adj 1. not good, as if from one’s butt. (‘Man, your lyrics are booty’.).