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Kill Stealing Fuck. Someone who either kill steal's habitually or kill steal's something that is worth a large amount of XP.
(Guy2 smashes into the dungeon you have been fighting though for hours and kills the boss)

Guy1: "Guy2 is such a ksf!"
ksf by awesome gamr February 24, 2010
Related Words
knee slap funny.
used like lol.
person 1: yesterday i fell and broke my nose
person 2: KSF!!
KSF by faenface October 6, 2008

levi (ksf) supremacy

cus levi gay n stuff
hey, do u believe in levi (ksf) supremacy?

of course!
The refusal to grow up, common words used are "cringe" "L + Ratio" "W" "Duo" and many others
OMG ksfq your a wuo
ksfq by l0minouz October 30, 2022

ksfdhgkuhgfsekgtjkjrg 

when ur supposed to study but you dony
unknown:wioah i feel like ksfdhgkuhgfsekgtjkjrg
Kelly's soooo Fuckin HOT!
There's this girl at work I'd love to fuck - KSFH
KSFH by Jonesy July 14, 2003