A phrase meaning all of the above, which can be heard in two popular instances:
1.) The movie Friday, where Chris Tucker pops his head into Ice Cube's window while ripping his curtain
2.) Chappelle's show, where wayne brady yells it at a character before gunning him down
(Ice Cube is getting his clothes ready when Smokey busts into the window)
Smokey: BREAK YO SELF FOO!!
Cube: Man! Look what you did to the curtain!
(Wayne Brady and Dave Chappelle are riding in a car when suddenly Wayne spots someone outside)
Wayne: Ah ha...there he is...
"BREAK YO SELF FOO!"
Guy: OH SHIT! IT'S WAYNE BRADY SON!
(Wayne proceeds to bust a cap)