| Abbreviation | Definition |
|---|---|
| BLTN | Better Late Than Never |
| BMG | Be My Guest |
| BMH | Broke My Heart |
| BNSRB | Be Not So Right Back |
| BOCTAOE | But Of Course There Are Obvious Exceptions |
| BQL | Browsing Query Language |
| BR | Best Regards |
| BRB | BathRoom Break |
| BRGDS | Best Regards |
| BRP | Big Room Planning |
| BSOD | Basic System Output Delimiter |
| BTAM | Be That As it May |
| BTB | By The Bye |
| BTDT | Been There, Done That |
| BTTC | Best Time To Call |
| BTW | Between |
| BTW | By The Way |
| BTWN | Between |
| BURMA | Be Upstairs and Ready, My Angel |
| BYG | Beautiful Young Girl |