Green’s Dictionary of Slang

(US black/P.R.) a woman, usu. black or Puerto Rican; also as term of address.

2000		P. Beatty Tuff 165: Mamí had me in the buck. I was the bitch, my knees all in my ears, her tongue showing a nigger’s anus much love.
2001		Fat Joe ‘We Thuggin’ 🎵 Got Cris’ on pop, Henny wit no chaser, mami don’t stop.
2012		J. Díaz This Is How You Lose Her 6: It’s because I love you mamí.
2012		‘Dutch’ ? (Pronounced Que) [ebook] [...] flirting with the Spanish mami next to him.
2012		‘Dutch’ ? (Pronounced Que) [ebook] You good, ma, I’ll give you that.