Top Definition
A common term in both internet and RL conversations. Someone who's sole ambition in life is to stop others from getting lulz or sometimes even epic lulz; often an internet user in a postion of power who tries to stop lulz-worthy acts of anarchy.
Person 1: WTF? Some n00b mod on wikipedia reverted my lulztastic edits to this page.
Person 2: What a Lulz Killer
--
Person 1: ZOMG this admin disabled my uber CS hacks; now I'll have to get headshots using only skill.
Person 2: o_O What an EPIC Lulz Killer
door Master. A. N. Onymous 27 januari 2008
Someone who ruins a perfectly good 'your mom' joke by bringing up the fact that their mother is dead and therefore spawning an awkward silence.
Me: So does your MOM.
Guy: My mom's dead.
Me: Jackass Lulzkiller...
door EpicFailJem 31 maart 2009
One who has killed a mass of lulz over an extended time period. Also one who stops lulz from occuring by not showing up where lulz occur.
Sean: Dude I asked Brian if he wanted to play CS with us after school.
Kareem: What'd he say?
Sean: He wants to hang out with his girlfriend instead.
Kareem: What an epic lulz killer.
door Vaginabuttfarts 24 februari 2008

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