commonly refers to a woman who has a great amount of sex with a large assortment of men. her meat curtains are always inhabited with a different male. the word comes from the term being "slammed", in the sense of Dwight Howard of teh Magic
D:yo jared have you seen that girl down the hall?
Jared: no, but i could hear her gettin slammed, i'm definitely staying away from that slamma jamma, because i don't want to catch what all those guys have