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when a moment occurs in ones life in which they have, or wish they had a camera, to take a picture of what is taking place...only in turn to upload the picture and set it as their default picture on facebook, myspace, twitter, etc.
2 guys in a weightroom...(no homo was previously called)

Guy 1: Dude i look so jacked in this mirror
Guy 2: Oh do i
Both: This is a default moment!!
by j. hahn 15 June 23, 2009
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