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1.
A verb most commonly heard in online FPS (First-Person Shooters.) It is the act of stabbing another player or person with a knife and thus killing them instantly.
Guy:Damn, some noob came up behind me and knifed me.
by Alex the Chao September 05, 2009
 
2.
verb : stabbed with a knife.
Brutus knifed Caesar.
by Kaiyo July 22, 2003
 
3.
To be slewn by a blade. Usually refers to CS.
I knifed a nub to cs coz I am a mofo! I am teh shitz.
by .NuKeZ January 13, 2005
 
4.
Knifed - To heavily slap someone that owes you money.

A term that is identified by having a capital 'K' mid-sentence.
Commanly used in Northern Ireland and Scotland
Frank; Did you ever get your gear back?
Smithy; No dude...
Frank; You going to Knife that doosh?
Smithy; Yeah dude, should have Knifed him ages ago!
by venomtwix July 26, 2011
 
5.
Means you are being stabbed by a "Knife", really stupid word in real life, but in the game "Counter-Strike" it's totally O.K!
Phil: OMG! FUXXING N00B, KNIFED, PWNEED! :P :P :P
Max: That was just lucky, u came from behind! :P
by TopeZ April 11, 2006