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Comes from the word hax. It describes the cheating action of lowering gravity on CS to give an unfair advantage to that player. Allowing them to jump higher and fly about. That player being a hax!!
"Yo!, did u see that guy using Flyhax? He was flying all over this baish..."

"That guy is a right n00b!!"

"Darn tootin'!!"
by Andy Martin June 06, 2005