when somebody cooks up a fresh batch of hot steaming pancakes, coats them thoroughly with a layer of rich golden syrup, and then proceeds to firmly smack them on the exposed butt cheeks of an unsuspecting victim
dude were you flapjacking last night because i got flapjacked so hard that the aunt jemimawaxed my butt hair
when some douchebag is driving like a dick and you stick your bare ass out the window and slap it while yelling flapjack as you pass him/her up and your driver hits the horn. can be done on either side of car but works best when you are turning left and they are stopped at a red light. flap jack flapjack
He got charged with indecent exposure for flapjacking an old lady when a cop was near.