| C&G | Chuckle And Grin | - | ISO Country Codes |
| C-P | Sleepy | - | ISO Country Codes |
| C-T | City | - | ISO Country Codes |
| C/P | Cross Post | - | ISO Country Codes |
| C/S | Change Of Subject | - | ISO Country Codes |
| C4N | Ciao For Now | - | ISO Country Codes |
| CAAC | Cool As A Cucumber | - | ISO Country Codes |
| CAS | Crack A Smile | - | ISO Country Codes |
| CAS | Clear As Sh*t | - | ISO Country Codes |
| CB | Chat Brat | - | ISO Country Codes |
| CB | Coffee Break | - | ISO Country Codes |
| CBA | Can't Be Arsed | - | ISO Country Codes |
| CBB | Can't Be Bothered | - | ISO Country Codes |
| CBF | Can't Be F*cked | - | ISO Country Codes |
| CBJ | Covered Blow Job | - | ISO Country Codes |
| CD9 | Code 9 (parents Are Around) | - | ISO Country Codes |
| CF | Coffee Freak | - | ISO Country Codes |
| CFV | Call For Vote | - | ISO Country Codes |
| CHA | Click Here Asshole | - | ISO Country Codes |
| CIAO | Goodbye (in Italian) | - | ISO Country Codes |
| CICO | Coffee In, Coffee Out | - | ISO Country Codes |
| CICYHW | Can I Copy Your Home Work? | - | ISO Country Codes |
| CID | Consider It Done | - | ISO Country Codes |
| CID | Crying In Disgrace | - | ISO Country Codes |
| CLD9? | Cloud 9? (Stoned?) | - | ISO Country Codes |
| CLM | Career Limiting Move | - | ISO Country Codes |
| CM | Call Me | - | ISO Country Codes |
| CMAP | Cover My Ass Partner | - | ISO Country Codes |
| CMF | Count My Fingers | - | ISO Country Codes |
| CMIW | Correct Me If I'm Wrong | - | ISO Country Codes |
| CMU | Crack Me Up | - | ISO Country Codes |
| CNP | Continued In Next Post (forums) | - | ISO Country Codes |
| COB | Close Of Business | - | ISO Country Codes |
| COD | Change Of Dressing | - | ISO Country Codes |
| COF$ | Church Of Scientology | - | ISO Country Codes |
| COS | Change Of Subject | - | ISO Country Codes |
| CRAFT | Can't Remember A F*cking Thing | - | ISO Country Codes |
| CRAP | Cheap Redundant Assorted Products | - | ISO Country Codes |
| CRAT | Can't Remember A Thing | - | ISO Country Codes |
| CRAWS | Can't Remember Anything Worth A Sh*t | - | ISO Country Codes |
| CRB | Come Right Back | - | ISO Country Codes |
| CRBT | Crying Real Big Tears | - | ISO Country Codes |
| CRDTCHCK | Credit Check | - | ISO Country Codes |
| CRS | Can't Remember Sh*t | - | ISO Country Codes |
| CRTLA | Can't Remember The Three-Letter Acronym | - | ISO Country Codes |
| CS | Career Suicide | - | ISO Country Codes |
| CSA | Cool Sweet Awesome | - | ISO Country Codes |
| CSL | Can't Stop Laughing | - | ISO Country Codes |
| CSN | Chuckle, Snicker, Grin | - | ISO Country Codes |
| CT | Can't Talk | - | ISO Country Codes |
| CTA | Call To Action | - | ISO Country Codes |
| CTC | Choking The Chicken | - | ISO Country Codes |
| CTC | Care To Chat | - | ISO Country Codes |
| CTO | Check This Out | - | ISO Country Codes |
| CU | Cracking Up | - | ISO Country Codes |
| CU | See You | - | ISO Country Codes |
| CUATU | See You Around The Universe | - | ISO Country Codes |
| CUIMD | See You In My Dreams | - | ISO Country Codes |
| CUL | See You Later | - | ISO Country Codes |
| CUL8R | See You Later | - | ISO Country Codes |
| CULA | See You Later Alligator | - | ISO Country Codes |
| CUNS | See You In School | - | ISO Country Codes |
| CUOL | See You OnLine | - | ISO Country Codes |
| CUWTA | Catch Up With The Acronyms | - | ISO Country Codes |
| CUZ | Because | - | ISO Country Codes |
| CWOT | Complete Waste Of Time | - | ISO Country Codes |
| CWYL | Chat With You Later | - | ISO Country Codes |
| CX | Cancelled | - | ISO Country Codes |
| CY | Calm Yourself | - | ISO Country Codes |
| CYA | Cover Your Ass | - | ISO Country Codes |
| CYA | See Ya | - | ISO Country Codes |
| CYE | Check Your Email | - | ISO Country Codes |
| CYL | See You Later | - | ISO Country Codes |
| CYM | Check Your Mail | - | ISO Country Codes |
| CYO | See You Online | - | ISO Country Codes |
| CYT | See You Tomorrow | - | ISO Country Codes |
