| Abbreviation | Definition |
|---|---|
| BRAT | Belligerent Rowdy Awful Teen |
| BRB | BedRoom Bully |
| BRBA | Baton Rouge Bar Association |
| BRICK | Bike Run It Can Kill |
| BS | Bad Science |
| BSA | Bad Suspect Account |
| BSA | Bank Secrecy Act |
| BSA | Better Send Assistance |
| BSA | Brain Splattering Art |
| BSB | Band Saw Boys |
| BSO | Benefit Settlement Option |
| BSP | Blatant Self Promotion |
| BSRB | Behavioral Sciences Regulatory Board |
| BTK | Bind, Torture, and Kill |
| BTO | Be The One |
| BTS | Brooklyn Terror Squad |
| BUG | Being Unusually Good |
| BUGS | Behavioural Unreliability Germination Syndrome |
| BUI | Boating Under the Influence |
| BUM | Back Up Man |