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This word originates from the terms, "Wank", wich is an english slang term for, Masturbate and tart, which is defined as a delicious cream filled pastry.

Definition: A pastry, cake, or other dessert item that has been ejaculated upon.
"No one pisses on my thread. You wanktarts."
by Hungrylizard August 27, 2004
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