Top Definition
The person at the party who heard, either through facebook (eg. events, reading wall-to-wall comments) or 'a friend' that the party was happening and decided that they should invite themselves even when they have no good business being there; ruining the night for everyone.
"err who invited that guy?"
"Oh, i guess he's a self-invitee"
"Wow what a douche"
Pete Sarich.
by UKnowWho@ur face February 12, 2009
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