Top Definition
The phenomenon by which an individual becomes aware that this is not the first time they have forgotten the same piece of key information.
Arsenio Billingham: Dude, what is that's chick's name again, the one with the really fat head?
Gary Kasparov: Man, you asked me that last month.
Arsenio Billingham: Whoaa, I just got the biggest dejamnesia
by arsenio billingham June 03, 2010

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