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1.
A person who regularly brings a knife or other cutting tool to their school/workplace in a vain attempt to look cool. They will frequently play with the knife and use it on every inanimate object in sight.
See also lighter fag
Robert you are a knife fag. Put your Gerber away, you don't impress anyone.
od uživatele I got no pants 20. Duben 2003
 
2.
Someone who constantly looks for an excuse to use their knife to accomplish trivial tasks that could easily be solved using you bare hands/teeth.
Dave: "Oh sweet a pack of skittles!"

*Pulls out knife from belt clip*

Joe: "Dude, you realize that doesn't require a knife, right?"

Dave: "Yea but then I won't look like a badass."

Joe: " You, my friend, are a knife fag."
od uživatele RaGeQuaKe 11. Září 2011
 
3.
A person who plays Modern Warfare 2 and runs around stabbing everyone with a knife
I would enjoy playing online much more if is wasn't for those knife fag's
od uživatele vatonyjmu1978 03. Únor 2010