Deep lore: Normally used among Hispanics towards other Hispanics. "Mojo" derives from "mojado" meaning "wet" i.e. wet-backs. Mojados are Mexican citizens while pochos are Mexican-Americans.
Deep lore: Used to be popular with political types who were down with their "African Roots." Made popular in the play "A Raisin in the Sun." Possibly of Creole origin meaning something similar to "foe."