Someone (usually Michael S.) who enjoys needlessly pointing out logical flaws by responding to internet conversations (that they weren't originally included in) with copious amounts of obscure (or useless/stalkerlike) information
Adam: "yeah, according to this list, the **** champs are ranked 22nd...that can't be right"
Mike: (ignoring **** reference) BLAHBLAHBLAHBLAH I SURF FORUMS ALOT AND LEARN ABOUT OTHER TEAMS THAT I'VE NEVER TALKED TO NOR COMPETED AGAINST BLAHBLAHBLABLAH THIS IS WHY YOU'RE WRONG BLAHBLAHBALHABLAH
A: You're a killjoy.
Mike: (ignoring **** reference) BLAHBLAHBLAHBLAH I SURF FORUMS ALOT AND LEARN ABOUT OTHER TEAMS THAT I'VE NEVER TALKED TO NOR COMPETED AGAINST BLAHBLAHBLABLAH THIS IS WHY YOU'RE WRONG BLAHBLAHBALHABLAH
A: You're a killjoy.
by Pissedofffacebookguy March 14, 2011
Get the Killjoy mug.by †wiligh† November 21, 2007
Get the Killjoy mug.Im emo but in Gerard Way.And its 2017.Say a word and Im gonna shot you with my killjoy-dangerous-watergun.
by Ivexsis August 28, 2017
Get the killjoy mug.by Light Joker May 19, 2005
Get the killjoy mug.The killjoy tattled to the apartment manager, after he saw Mike enter his apartment with a gorgeous woman at midnight.
by Ronald Clifford Buckman August 9, 2003
Get the killjoy mug.When Bob walked in, and then everybody's expression changed and everyone stopped talking, Bob is a real killjoy
by Chieftawsmcool January 18, 2011
Get the killjoy mug.