when somebody gets suprised anally. Also known as getting a penis or another erect object up the butt. Usually between two men. Another word for buttsecks.
Person 1: What's the best kind of suprise?
Person 2: What?
Person 1: An anal suprise!!!
by dalton and nick December 12, 2006
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WHEN SOMEONE STICKS THEIR WILLY IN YOUR NILLY
God I love suprise anal, he stuck his willy in nilly again.
by Sênior Long Schlong October 8, 2017
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