What is C1?
1.
From the PC game Counter-Strike, where C1 will send a radio message 'Roger that'.
Now used in real life.
Geek 1: Man this new monitor rocks!
Geek 2: C1 on that.
See
2.
"afirmative" - a phrase in the game counter-strike
Rh0x (DEAD): man that LyNx kid is a faggot
Sh0cK(DEAD): c1
See
3.
A cs-ers
someone: "Need backup"
lilgirl: "c1"