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A cute word for condom.
Don't be a prat, wear a willy-hat!
by Gee, Ro, Sarah and Bee May 06, 2005
A Condom, Protection against disease and prevention of Children.
Man: "Oh shit, i've ran out of Willy Hats, did you bring any?"

Woman: "Yes, Luckily!"
by Fuckyoumert July 30, 2008