Top Definition
The anniversary of one's birth.

Interesting way of saying 'birthday'.
Today is my annibirthary, I hope I get lots of presents and cake!
by hafofme April 15, 2010
When a husband and wife share a birthday and then get married on their birthday.
Katie and Greg share a birthday and then got married on their birthday. This day is now their annibirthary.
by gmoney625 June 25, 2012
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