The term is used to describe a person who is both Mexican and Black. Basically just a combination of Wetback and Black
Alicia isn't really black, and not really mexican, that chick is a wetblack
by Boomin850 July 17, 2006
A person of mixed racial heritage, a mix of African-American and Hispanic.
"Hey, have you seen Tyrone and Lupita's kid? That's one fine lookin' wetblack."
by JoshuaH20 January 30, 2008