a celebration held on the anniversary that you had with an ex in which you do things for yourself, most likely the things your ex never did to celebrate that day. For example go out to dinner, buy yourself flowers,or any other self pampering.
Girl: This year for my exiversary I am going to get my nails done and go out to dinner.
Boy: Great first round is on me!
Boy: Great first round is on me!
by Miss Jeanine April 2, 2009
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