| J | Joking | |
| J/C | Just Checking | |
| J/K | Just Kidding | |
| J/P | Just Playing | |
| JAM | Just A Minute | |
| JAS | Just A Second | |
| JASE | Just Another System Error | |
| JBOD | Just A Bunch Of Disks | |
| JC | Just Checking | |
| JC | Just Chilling | |
| JC | Just Curious | |
| JIC | Just In Case | |
| JIT | Just In Time | |
| JK | Just Kidding | |
| JLMK | Just Let Me Know | |
| JM2C | Just My Two Cents | |
| JMHO | Just My Humble Opinion | |
| JMO | Just My Opinion | |
| JOOC | Just Out Of Curiosity | |
| JP | Just Playing | |
| JS | Just Saying | |
| JSNM | Just Stark Naked Magic | |
| JSYK | Just So You Know | |
| JT | Just Teasing | |
| JTLYK | Just To Let You Know | |
| JW | Just Wondering | |
| (-: to the Emoticons :-) |
