Top Definition
When a male surprises a woman expecting to recieve sexual intercourse through the vagina and unexpectedly recieves a surprise anally. Can be used as a verb or a noun. --BigDaddayWood
Noun: Anabelle, expecting intercourse through her vagina, recieved a Santa Sack Surprise from her boyfriend Carlos, who gave it to her anally.
Verb: Carlos Santa Sack Surprised his girlfriend Anabelle and Anabelle was flustered
by BigDaddayWood May 26, 2009
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