| Abbreviation | Definition |
|---|---|
| JK | Just Kidding |
| JKP | Just Keep Pestering |
| JMHO | Just My Honest Opinion |
| JML | Just My Luck |
| JMS | Just Making Sure |
| JST | Just |
| JST | Just Stop Talking |
| JT | Joint |
| JTM | Just Talking to Myself |
| JUM | Jumble |
| JW | Just Wait |
| JWI | Just Wingin' It |
| JWZ | Jee, Whiz! |
| KEWL | Cool |
| KFA | Kindly Find Attached (email jargon) |
| KIC | Keep In Contact |
| KIT | Keep It Together |
| KK | Okay, Okay |
| KL | Cool |
| KLM | Calm |