Green’s Dictionary of Slang

(US black) to have sexual intercourse with.

1972		(ref. to late 1960s) B. Rodgers Queens’ Vernacular 87: anal intercourse [...] bless (kwn NYC, black gay sl, late ’60s: ‘Honey, he blessed me!’).
2000		Ebonics Primer at www.dolemite.com 🌐 bless Definition: 1. to give someone something for free 2. to have sex Example: Yo, bless with me a ci, son.