Top Definition
A "Happy Deathday" is when a man or woman is made to down a dirty pint through a party funnel on the day of their birthday, usually to a chorus of their friends singing "Happy Deathday."

If the victim still hasn't finished by the time the song is over then their friends may count to the victims age (in seconds) while continuing to pour any non-toxic liquid they can find into the funnel.
Jordan: "The last thing I remember was not being able to finish my Happy Deathday in time, everything after that is a mystery."
by Captain Faceplant September 02, 2009

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