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The act of ejaculating into your hand after direct intercourse from behind, and smearing it into your partners face without warning. A customary shout of "SURPRISE" should follow
Chris 1: "Man, my girlfriend is really pissing me off"

Chris 2: "You should tell her off!"

Chris 1: "I'll just give her a Surprise Bag"

Chris 3: "SURPRISE!!"
by Mr.Watch and Game June 17, 2011
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