| Abbreviation | Definition |
|---|---|
| BCNU | Be Seeing You |
| BCZ | Because |
| BD | Big Deal |
| BDAY | Birthday |
| BETW | BETWeen |
| BF | Best Friend |
| BF | BoyFriend |
| BFF | Best Friends Forever |
| BFFAA | Best Friends Forever And Always |
| BFFFL | Best Freaking Friend for Life |
| BFFN | Best Friends For Now |
| BFN | Bye For Now |
| BFTGT | Battle For The Good Thing |
| BFW | Back From Work |
| BHS | Be home soon |
| BIO | By Invitation Only |
| BIRTD | Birthday |
| BITW | Best In The World |
| BKD | Backed |
| BKFST | Breakfast |