When you slowly tilt your body sideways, allowing a fart to escape your bum noiselessly while sitting on a chair.
Called the cheeker do the the uprising of your butt cheeks from the chair and into the air as you fart.
boy: Dude, I could tell that she was about to pull a cheeker when her body started to tilt sideways on her chair. I ran for it-girl farts stank!
When a woman's mouth is wide open dude to shock, laughing, e.t.c, a man with an erect member comes in from the side, and rockets his member into the mouth of the recipient forcing her cheek outward from the inside. The force of the thrust causes her to go with it, in a fish-to-hook matter.
The action must be a total surprise to the recipient, allotting her shocked expression.
Girl: "And I was like OOO(mouth wide open) my god"
Guy:.................................^Perfect moment.
Guy:" POP A CHEEKER BITCH!"