| Term | Definition / Meaning / Stand for |
| BOMB |
Awesome, excellent (e.g., “That song is bomb”) |
| BITD |
Back In The Day |
| BOT |
Back On Topic |
| BTFO |
Back The F*** Off |
| BTFU |
Back The F*** Up |
| BTTT |
Back To The Topic |
| BTT |
Back To Topic |
| B2W |
Back To Work |
| BAMF |
Bad A** Mother F***** |
| BA |
Bad A** |
| BBIAB |
Be Back In A Bit |
| BBIAR |
Be Back In A Room |
| BBL |
Be Back Later |
| BBS |
Be Back Soon |
| BTAIM |
Be That As It May |
| BBG |
Beautiful Baby Girl |
| BISS |
Because I Said So |
| B/C |
Because |
| BC |
Because |
| BTDT |
Been There, Done That |
| BAM |
Below Average Male |
| BSF |
Best Sister Forever |
| BW |
Best Wishes |
| BLNT |
Better Luck Next Time |
| BBEG |
Big Bad Evil Guy (common in gaming or storytelling) |
| BFD |
Big F****** Deal |
| BM |
Bite Me |
| BF |
Boyfriend |
| BNO |
Boys' Night Out |
| BUMP |
Bring Up My Post |
| BYOB |
Bring Your Own Beer/Bottle |
| BRUH |
Bro (informal term for friend) |
| BMS |
Broke My Scale (used for rating things, often attractiveness) |
| BFAM |
Brother From Another Mother |
| BS |
Bullsh** |
| BWL |
Bursting With Laughter |
| BB |
Bye Bye |
| B4N |
Bye For Now |
| BITCH |
Babe In Total Control of Herself |
| bbz |
Babes |
| babi |
Baby |
| bebe |
Baby |
| BILU |
Baby I Love You |
| bakk |
Back |
| BHWU |
Back Home With You |
| BIAF |
Back In A Few |
| BITOD |
Back in the old days |
| BOTEC |
Back Of The Envelope Calculation |
| BTHU |
Back The Heck Up |
| B2B |
Back To Back |
| B2B |
Back To Back |
| BTK |
Back To Keyboard |
| BTTF |
Back To The Future |
| BTTP |
Back To The Past |
| BTY |
Back To You |
| BAMF |
Bad Arsed Mother Fucker |
| BAMBI |
Bad Arsed Mother Fucker Bit It |
| BAMF |
Bad Ass Motherfucker |
| B8 |
Bait |
| BG2 |
Baldur's Gate 2 |
| BAMW |
BAM Workshop |
| BANJO |
Bang Another Nuisance Job Out |
| BGNG |
Banging |
| BMHATK |
Banging My Head Against The Ke |
| BCSS |
Bangladesh Cactus and Succulent Society |
| BURP |
Bankrupt Unemployed Rejected Person |
| Barb |
Barbarian |
| B2B |
Barbarossa To Berlin |
| BBQ |
Barbecue |
| BFH |
Bastard From Hell |