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Getting "over-excited" after a large killing spree or an epic multi-kill.
"Reaver got a killgasm for getting three consecutive kills."

"Jones experienced a large killgasm for his monster kill in Unreal Tournament 2004."
by Chapst1ck March 30, 2007
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2
Getting a kill streak of 20 in any online first person shooter match that causes a sensation to surge the body and make you dominate even more.
"Dude that was fucking awesome I just got a killgasm."
by MIDKNIGHT22 January 21, 2009
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