face-turning
Smacking someone’s head with your hand while turning away like you just saw their ugly face. It’s either a joke or a full-on insult depending on how hard you hit.
My cousin face-turned me during lunch because I said his hair looked like a raccoon’s butt.
At the party, my friend face-turned the DJ when the song turned into a karaoke disaster.
My mom face-turned me when I told her I failed math again.