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1.
1:noun;

In MMORPG terms when the tank of the group appears to be doing his/her job while not actually holding any aggro.

2:noun;

In a First Person Shooter, a bullet or rocket travels directly through a target, usually a tank, without doing any damage.
This is ridiculous I shot InURbase4103 at least 20 times already. He is such a Ghost tank.
by EvanK.is.a.Ghost.Tank December 07, 2010