| Abbreviation | Definition |
|---|---|
| J | Joke |
| J/K | Just Kidding |
| J/K | Just Kidding (Joking) |
| J/O | Jerking Off |
| J2LUK | Just To Let You Know |
| J2LYK | Just To Let You Know |
| J4F | Just For Fun |
| J4G | Just for Grins |
| J4U | Just For You |
| JAC | Just A Cat |
| JAC | Just Awesome Communication |
| JAE | Just About Everything |
| JAE | Just Ain't Enough |
| JAF | Just A Friendly |
| JAFFA | Just Another Fat F***ing A**hole |
| JAFM | Just A Few More |
| JAG | Juicy And Gorgeous |
| JAG | Just Another Good |
| JAG | Just Another Guy |
| JAHA | Jeremy Anderson Hard A** |