C's
C&G - Chuckles And Grins
CBL - Come Back Later
CID - Crying In Disgrace
CIS - Compuserve
CNP... - Continued In Next Post
COI - Come On In
CP - Chat Post
CQ or CQ their name - Requesting a chat with their name
CRBT - Crying Really Big Tears
CSG - Chuckls, Snickers, Grins
CSS - Can't Stop Smiling
CU - See You
CUIC - See You In Church
CYA - See Ya
CYL8TR or CYL8R - See You Later
CYPUWIPD - Can You Pick Up What I'm Putting Down