Top Definition
The succesful completion of masturbating to orgasm in the 24 hour period on one's birthday an equal amount of times to the age they will turn. i.e. 24th birthday would be required to masturbate 24 times.
Man, Erik gave up porn for good after his castration accident during the birthday challenge.
by thesarlac June 27, 2007
5 Words related to birthday challenge

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