| Abbreviation | Definition |
|---|---|
| JEW | Jimmy Eat World |
| JFA | Jodi Foster's Army |
| JFJ | Just For Jokes |
| JFK | Jiggly Fat Koala |
| JFK | John Flapjack Kerry |
| JFK | Just Friggin Krazy |
| JFK | Just Full of Kibosh |
| JGP | Joking Garrulous Paul |
| JIJ | Jacqui In Jersey |
| JIM | Jon's Intelligent Mates |
| JIT | Just for Idiots and Technology |
| JIT | Just Inventory Time |
| JJ | Jealous Joey |
| JJ | Jumping Jellybeans! |
| JJ | Just Janis |
| JJ | Juststandingthere Justdoingnothing |
| JK | Joke |
| JKMF | Just Kidding My Friend |
| JM | Jilted Mindz |
| JM | Joe Mama |