A punch so powerful to the extent of completely obliterating the receiver of the facefull's face. This punch must knock the one on the receiving end out, and obviously, must be applied to the face.
A: "This jackass was annoying me to death, I hated it."
B: "So? What did you do?"
A: "Give him a facefull. Obviously."
B: "So? What did you do?"
A: "Give him a facefull. Obviously."
by Sum-buddy November 07, 2015