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An onliner is someone who plays CS online and does things which are normally impossible to do on LAN. For example an onliner may HS you while on a ladder or while in mid air. These acts are usually met with agression from players who recieve such ridiculous HS's and thus the term onliner was born.
"Get fuck you stupid onliner, diol"
"Yeah id like to see that online you stupid random"
by Mogga December 15, 2005
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A phrase used by insecure Counter-Strike players to insult other players who don't compete on LAN after getting owned by some dude who is probably better than him
Player 1: *Owns Player 2*
Player 2: Do that on LAN you fucking onliner piece of shit
by randomnibbaman December 29, 2018
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An onliner example is like,

Avamarie is reading this
Daisy is reading this
Katie is reading this
Frankie is reading this
Trey is reading this
Maybe Nick is..
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