| C&G | Chuckly and Grin |
| C/P | Cross Post |
| C/S | Change of Subject |
| C4N | Ciao For Now |
| CAAC | Cool As A Cucumber |
| CB | Chat Brat -or- Coffee Break |
| CBB | Can't Be Bothered |
| CBF | Can't Be F***ed |
| CBJ | Covered Blow Job |
| CD9 | Code 9 - it means parents are around |
| CF | Coffee Freak |
| CFV | Call For Vote |
| CHA | Click Here Asshole |
| CIAO | Goodbye (in Italian) |
| CICO | Coffee In, Coffee Out |
| CICYHW | Can I Copy Your Home Work |
| CID | Consider It Done -or- Crying In Disgrace |
| CIS | CompuServe Information Service |
| CLM | Career Limiting Move |
| CMAP | Cover My Ass Partner |
| CMF | Count My Fingers |
| CMIW | Correct Me if I'm Wrong |
| CMU | Crack Me Up |
| CNP | Continued in Next Post |
| COB | Close Of Business |
| COD | Change Of Dressing |
| CofS | Church of Scientology |
| COS | Change Of Subject |
| C-P | Sleepy |
| CRAFT | Can't Remember A F***ing Thing |
| CRAP | Cheap Redundant Assorted Products |
| CRAT | Can't Remember A Thing |
| CRAWS | Can't Remember Anything Worth A Sh** |
| CRB | Come Right Back |
| CRBT | Crying Real Big Tears |
| crdtchck | it means: credit check |
| CRS | Can't Remember Sh** |
| CRTLA | Can't Remember the Three-Letter Acronym |
| CS | Career Suicide |
| CSA | Cool Sweet Awesome |
| CSL | Can't Stop Laughing |
| CSN | Chuckle, Snicker, Grin |
| C-T | City |
| CTA | Call To Action |
| CTC | Choking The Chicken -or- Care To Chat |
| CTO | Check This Out |
| CU | See You -or- Cracking Up |
| CUATU | See You Around The Universe |
| CUL | See You Later |
| CUL8R | See You Later |
| CUNS | See You In School |
| CUOL | See You OnLine |
| CUZ | it means: because |
| CWOT | Complete Waste Of Time |
| CWYL | Chat With You Later |
| CX | it means: cancelled |
| CY | Calm Yourself |
| CYA | Cover Your Ass -or- See Ya |
| CYL | See You Later |
| CYM | Check Your Mail |
| CYO | See You Online |
| CYT | See You Tomorrow |
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