Top Definition
A prank involving someone being on a friend's Facebook account (either by knowing the password or by the victim leaving their account signed in) changing the birthday of the victim to the next or same day. The consequence being that the victim will be bombarded with many birthday messages on a day that is not their birthday. Performing this several times in one week will yield the best results.
Danny left his Facebook account open! It's high time that he get birthday'd....
by Trucky Cheese November 10, 2010

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