As a girl's name it is a variant of Melanie (Greek), and the meaning of Melaina is "black, dark".
BEST FRIEND: I bet shes a melaina
Slang for a typically busty blond often gangbanged by members of the New York Chapter of the Latin Kings Gang
verb: to gangbang a busty blond
"Damn son, that Melaina was super tight."
"Did you just get Melaina'd or did you get your dick sucked too"