Top Definition
Noun: A slightly more extreme variation on the childish prank known as the wet willy. Instead of inserting a finger into your mouth and then into someone's ear with a twisting motion, you first insert your finger into your anus, then into the recipient's mouth. Twisting is optional.
"-Why did Suzie leave school early today?

-Johnny gave her a dirty willy and she threw up...

-HAHAHA sucks for her."
by FruitoftheLoomis October 15, 2010

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