Real motherfucker, someone who always commits to whatever they are doing.
For example, yo did you see Steve knock that guy out who checked out his girls ass? He's a real motherfucker
Billy J. His name alone tells you he is, was, and always will be one of the realest motherfuckers there ever was. Billy the realest motherfucker who everwas,gives nofucks about motherfucker who wasn't. He has been said to have told Chuck Noris to his face he looked like a fake motherfucker and walked away unscathed.
Yo Clark who is that? "That's a real motherfucker like Billy".
See that guy with the 09 Escape, Batman wallpaper and sunglasses? Real Ass Motherfucker💯 ,is his name bitches