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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2
The act of circumsizing ones own penis with a homeless man or woman's teeth. Then having them taking the foreskin and putting it on top of an ice cream sundae and shitting on top preferably using the blood from operation to replace said cherries.
I won't even touch a man until he's had a dirty Willy done.
by TO7372727 January 29, 2017
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