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A Team-Killing Fucktard is commonly encountered in online team-based games, such as Halo (where the term originted).

Normally they are Noobs or Newbs, or just Fucktards in general.

Team-Killing Fucktard can be abbreviated to TKFT. Plural version of the noun is TKFTs. It can also be used as an adjective to describe someone who has killed a team member. There are two definitions of such team-killers,
True Team-Killing Fucktards (TTKFT) and Enraged Team-Killing Fucktards, also known as RageQuit TKFTs (RTKFT or RQTKFT)

The origin of the Team-Killing Fucktard originated from popular Halo webseries, Red Vs Blue (RVB) it can also be said that the first recognized TKFT is Caboose from the series, for killing team-captain Church with a tank in the first season. Caboose may not be the first TKFT, but the famous incident has sparked awareness of the dangers that TKFTs present to the online-gaming community and beyond.
You shot Church, you Team-Killing Fucktard!
by Super-Ultimate-Ownage-Penguin September 11, 2011
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One who kills (either accidentally or purposefully) a member of his or her own team. Someone who should be killed themself. often used after a lasertag game with friends, during a counterstrike or halo game, or any of the other FPS or gun-related team games.
Damnit, you team killing fucktard, Watch where you're shooting!

You fucking killed me, Team Killing Fucktard!
by Aadon Gondahlvor February 10, 2004
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Somebody who kills a member of his halo team out of boredom or accidentalities
You shot church you team killing fucktard!
by Yaren September 30, 2004
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when u kill ur cohorts, team mate, or distraction. AKA, caboose from Red vs. blue
Tucker: You killed Church you team killing fucktard!!!
by gunslingergirlvy_c_e August 09, 2005
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1) Someone who demonstrates the qualities of a fucktard (See definition) before, after, or during the action of killing a teammate in an online game.

2) Caboose, from Red vs. Blue
You teamkilling fucktard! You shot your CO!
by Shadowlings Tear January 29, 2005
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a team killer "in halo, cs,ect frist person shooters"
kills team mate's too often...
"a dumb-ass"
invented by red vs blue
killing any team members and or themself.
you killed the whole team, "you team killing fuck tard"
by juutin June 18, 2006
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