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(n) A termed used for someone whose low attention span allows them to simply disappear at will, only reappearing after a determined amount of time chosen by the "ninja"
Pat: Hey John stay here I'll be right back.
~30 seconds later~
Pat: Hey Steve did you see John?
Steve: No, I thought he was with you.
Pat: Damn that boy is a damned ADD Ninja!

This term actually dates back a few years. Thought only to be an inside joke between friends to discribe one of the group, I left the state I was living in at the time. I moved to a larger city only to have it used there too. The origin is still unknown to me.
by Greyn1 April 06, 2009
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