| Abbreviation | Definition |
|---|---|
| CL | Cyril Lucian |
| CLIFF | Clifford |
| CM | Charles Miguel |
| CM | Cool Mom |
| CODP | Child Of Deaf Parents |
| COLCESTRIAN | Person of Colchester, Essex, UK |
| Cole | Colton |
| COW | Charming Older Woman |
| CP | Christian Philip |
| CP | Cutie Pie |
| CRJ | Carly Rae Jepsen |
| CSX | Crash Smash Xplode (Another name for CSX Railway) |
| CT | Cleveland Thurman |
| CTG | Chittagong |
| CW | Charles Willie |
| CW | Clarence William |
| CWG | Crazy White Guy |
| D | Dad |
| D | David |
| D | Dean |