Shut the fuck uppercut.
An uppercut directed squarely into one's chin, breaking their jaw and rendering their voice box useless.
Bob: Josh was talking crap about me, so I made him STFU.
Jane: How did you do that, my strangely sexually obsessed friend?
Bob: I gave him an STFUC.
Jane: Haha, you're such a twat.
Bob: STFUC!!
