Green’s Dictionary of Slang

lazy, inefficient.

1972		Milner & Milner Black Players 48: Now I got me a poop-butt hippie chick who can’t get behind turning tricks.
1994		N. McCall Makes Me Wanna Holler (1995) 143: Some white poot-butt dude.
2002		Simon & Burns ‘The Pager’ Wire ser. 1 ep. 5 [TV script] They can run out all the little poop-butt locals and shit.