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2.
A person who plays Counter Strike fanatically and often compares other games to it.

CSer is either used in a derogitory fashion within communities of other games, or just to state that that person plays "CS".
Jack's a pretty good CSer

Why don't you go back to your rank-whoring you stupid CSer
by Bluehawk July 16, 2004
 
1.
1) Word used to describe a player of the game Counter-Strike
2) A person, usualy between the ages of 8 and 12 that has the IQ between 15 and 45
Just ignore all the CSers
by maxdamage January 11, 2004
 
3.
N.

a member of the website www.couchsufring.com

pl. CSers

Me and another CSer explored Rome together!
by CSer in Action April 15, 2009
 
4.
Discrete way to say Cock Sucker.
I hate Bo, he is such a CSer !!!
by Kyle L November 12, 2005