| C | See | |
| C&G | Chuckle And Grin | |
| CADET | Can't Add, Doesn't Even Try | |
| CAS | Clothing Aquisition Syndrome | |
| CB | Chat Brat | |
| CC | I Understand | |
| CC | Carbon Copy | |
| CFV | Call For Votes | |
| CHINGO | Chat Lingo | |
| CICO | Coffee In, Coffee Out | |
| CID | Crying In Disgrace | |
| CID | Consider It Done | |
| CIS | Consumer Information Service | |
| CM | Call Me | |
| CME | Checking My E-Mail | |
| CMF | Count My Fingers | |
| CMIIW | Correct Me If I'm Wrong | |
| CNP | Continued (In My) Next Post | |
| CO | Conference | |
| CO | Company | |
| COB | Close Of Business | |
| COC | Code Of Conduct | |
| COS | Child Over Shoulder | |
| CP | Chat Post | |
| CRAFT | Can't Remember A Freaking Thing | |
| CRBT | Crying Real Big Tears | |
| CRS | Can't Remember Stuff | |
| CRTLA | Can’t Remember The Three Letter Acronym | |
| CRZ | Crazy | |
| CSG | Chuckle, Snicker, Grin | |
| CSL | Can’t Stop Laughing | |
| CTR | Center | |
| CU | See You | |
| CU@ | See You Around | |
| CU2 | See You, Too | |
| CUB | Call You Back | |
| CUL | See You Later | |
| CUL | Call You Later | |
| CUL | Catch You Later | |
| CUL8ER | See You Later | |
| CUL8R | See You Later | |
| CULA | See You Later, Alligator | |
| CUNS | See You In School | |
| CUOL | See You Online | |
| CUS | See You Soon | |
| CUZ | Because | |
| CWOT | Complete Waste Of Time | |
| CWYL | Chat With You Later | |
| CWYL | Chat With You Later | |
| CY | Calm Yourself | |
| CYA | See Ya | |
| CYAL8R | See You All Later | |
| CYE | Check Your E-Mail | |
| CYL | Catch Ya Later | |
| CYL | See You Later | |
| CYO | See You Online | |
| CYOA | Cover Your Own Assets | |
| CYR | Call Your | |
| CYT | See You Tomorrow | |
| CYWW2BY | See You; Wouldn't Want To Be You | |
| (-: to the Emoticons :-) |
