gully, adj. — Green’s Dictionary of Slang

gully adj.

[fig. use of SE gully, a gutter, which has the same credibility as street adj.]

(orig. US) basic, fundamental; vulgar.

1965		(con. 1950s) Carmichael & Longstreet Sometimes I Wonder 301: All I’m interested in is the real gully low jazz. I mean the real thing, not just cool or progressive riffing.
1993		Onyx ‘Bang 2 Dis’ 🎵 Grimy, go-hard, gully, get your ass beat on and off stage shit.
2003		Urban Dict. 30 Apr. 🌐 Gully: Something from the streets, gutter, and/or gangsta.
2005		Jade LB Keisha the Sket (2021) 23: ‘i jus gt 1 gully idea’.
2012		7Eventhirty ‘Twenty Twelve’ 🎵 One touch, and I’m inclined to get gully and vulgar.