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1.
refers to the ability to recognize other gamers
My gamedar tells me that the chick wearing the wow shirt is a gamer.
by Celeste McWhorter March 28, 2008
 
2.
The radar in certain first person shooters/hybrids (such as Halo, Fallout 3, and Doom) that tells the player where enemies and other NPCs are.
"Turn off the gamedar, bitch -- using it's for pussies!"
by Christ Chen February 04, 2009