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When one takes his/her soiled underwear and then precedes to take their underwear off, facing the soiled portion towards the other persons chest and slapping it on their chest.
"Did you hear about Sally getting a Flap Jack Surprise the other night from Tom?"
by Awesome Pants March 23, 2007

Words related to Flap Jack Surprise

birthday flap flapjacks jacks pancakes poop shit surprise underwear