Green’s Dictionary of Slang

(US black) the penis.

1988		Boogie Down Prods. ‘Jimmy’ 🎵 Well, Red Alert is down with BDP / Teachin’ you all about Jimbrowski.
1988		Ice-T ‘Personal’ 🎵 jimbraski will go to work and penetrate.
1992		UGK ‘Trill Ass Nigga’ 🎵 Cause I’m out to demean, count the green / and throw that jim in the in-between.
1995		L. Stavsky et al. A2Z 57/1: jimbrowski – n. penis.
2002		‘Touré’ Portable Promised Land (ms.) 154: We Words (My Favorite Things) [...] Ill na na. Jimbrowski.