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Smacking someone's bare butt cheeks on either side of their face and letting a stink bomb go off. The victim is usually so wasted they don't even realize you're there, and you're gone before they can react.
My cousin face farted me in a karaoke bar and I didn't notice until I smelled like a dead raccoon.
At the party, my friend face farted me and I had to run outside to puke.
During the football game, my brother face farted me and I almost lost my seat.