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1.
A common attack in the Xbox360 game Gears of War, where you stick a frag to an enemy, making it impossible for the tagged enemy to avoid death.

This attack pisses people of... Big time
Dude knock it of with the fragtagging, tis ghei.
by El Tanos January 26, 2007
 
2.
When two or more people throw frags at each other simutaneously. Whoever lives through afore-mentioned frag cluster fuck wins. Normally frag tag is played in Call of Duty 4 or World at War
You wanna be a frag fag? Then lets play frag tag....
by BMF Wardy January 18, 2009