Brace yoself foo'
Get ready; be prepared
Delonte: Yo Jamz, why you be all up in my grill dawg?
Jamal: Shut yo mouth muthafucka! I gotta can of whoop-ass waitin for you so yo u betta brace yoself foo'!
Jamal: Shut yo mouth muthafucka! I gotta can of whoop-ass waitin for you so yo u betta brace yoself foo'!
Brace yoself foo'
Misunderstanding of break yourself, meaning "prepare to submit" to robbery, ass-kicking, etc.
White kid, misunderstanding Chapelle's Show, yells out "Brace yoself foo'!" and then throws a water balloon at his older sister.