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1.
noun: the epitomy of suckiness, taken from Internet slang used mostly by gamers and forum-addicts
LOL OMG taht map was teh sux!!!!1!11
by Sonic Infidel January 14, 2004
 
2.
Opposite of teh sex. Something is the worst, least appealing, the lowest. Usually the thing being described is disappointing to the user of the phrase.
'This is teh sux'
'You're telling me'

by SkrewyRebirth March 22, 2006