Green’s Dictionary of Slang

1. a general term of derision, with overtones of bad odours.

1969		‘Iceberg Slim’ Pimp 137: Some po stupid Nigger’s funky-ass, nappy-head Southern Mammy.
1978		H. Selby Jr Requiem for a Dream (1987) 244: Youre going to sit and wait in a funky ass coffee shop for her?
1980		E. Folb Runnin’ Down Some Lines 91: Callin’ him a funky-ass-low-life-son-bitch!
1996		UGK ‘One Day’ 🎵 My nigga Pop died on the corner / Behind a funky-ass dice game.
1997		L. Pettiway Workin’ It 175: For this old funky-ass pussy.
2005		S. Franklin Streets of N.Y. 70: I closed the door to that funky ass room.
2021		S.A. Crosby Razorblade Tears 149: ‘You’re better than those funky-ass bikers’.

2. (also funky-butt) thus, on bad = good model, excellent, exciting [butt n.¹ (1a)].

1970		A. Young Snakes (1971) 36: He pick up one of these plastic ukeleles [...] and play some funkybutt blues make you cry.
1993		Dr Dre ‘Deeez Nuuuts’ 🎵 Or some funky ass shit by the d-o-double g-y-d-o-double g.
1997		(con. 1970s) G. Pelecanos King Suckerman (1998) 58: Some funky-ass double-buck shake the two of them had worked out.
2005		R. Stravinsky DesruC: (Cursed) 85: She wished that he would get rid of those big funky ass cigars that he liked.
2005		V.M. Harley True Love Too Late n.p.: The bottom was straight but not tight and she found these funky ass lace granny boots to wear underneath.