| Acronym | Meaning |
| BAC | Back At Computer Blood Alcohol Content By Any Chance |
| BACS | Bankers Automated Clearing System |
| BAGL | Bust A Gut Laughing |
| BAH | Bored As Hell |
| BB | Big Brother Be Back |
| BB4N | Bye-Bye For Now |
| BBAM | Be Back After Meal |
| BBB | Bugging Beyond Belief |
| BBBW | Big Beautiful Black Woman |
| BBC | British Broadcasting Corporation |
| BBEG | Big Bad Evil Guy |
| BBFL | Best Buds For Life |
| BBFN | Bye Bye For Now |
| BBG | Best Be Going |
| BBIAB | Be Back In A Bit |
| BBIAF | Be Back In A Few |
| BBIAM | Be Back In A Minute |
| BBIAS | Be Back In A Sec |
| BBIAW | Be Back In A While |
| BBK | Boy Better Know |
| BBL | Be Back Later |
| BBM | Blackberry Messaging |
| BBML | Be Back Much Later |
| BBN | Be Back Never |
| BBO | Being Bored Online |
| BBQ | Barbecue Better Be Quick |
| BBR | Blonde, Brunette, Redhead |
| BBS | Be Back Soon Bulletin Board System |
| BBT | Be Back Tomorrow |
| BBV | Brags Beats and Variance (poker) |
| BBW | Big Beautiful Woman |
| BBWL | Be Back Way Later |
| BC | Before Christ |
| BCBW | Bow Chica Bow Wow |
| BCC | Blind Carbon Copy |
| BCD | Behind Closed Doors |
| BCE | Before Common Era (like ) |
| BCF | Best Cousin Forever |
| BCG | Birth Control Glasses |
| BCS | Bowl Championship Series |
| BD | Big Deal |
| BDN | Busy Doing Nothing |
| BDOML | Best Day Of My Life |
| BDU | Brain Dead User Battle Dress Uniform |
| BFA | Best Friends Always |
| BFAB | Born From A Boombox Back For A Bit |
| BFAM | Brother From Another Mother |
| BFB | Better From Behind |
| BFF | Best Friends Forever Big Fat Friend/Female |
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| BFFAE | Best Friends Forever And Ever Best Friends For All Eternity |
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| BFFL | Best Friend For Life |
| BFFLE | Best Friends For Like Ever |
| BFFLTDDUP | Best Friends For Life Till Death Do Us Part |
| BFFN | Best Friend For Now |
| BFFWB | Best Friend Forever With Benefits |
| BFITW | Best Friend In The World |
| BFK | Big Fat Kiss |
| BFMV | Bullet For My Valentine (band) |
| BFN | Bye For Now |
| BFP | Bad For Pics Big Fat Positive ie pregnant |
| BFTP | Blast From The Past |
| BFUT | Best Friends Until Tomorrow |
| BFWB | Best Friend With Benefits |
| BG | Bad Game Baby Gangster |
| BGD | Black Gangster Disciples |
| BGF | Best Girl/Guy Friend |
| BGL | Big Game License, likes fat people |
| BGM | Background Music |
| BGT | Britain’s Got Talent (TV show) |
| BH | Be Happy Bloody Hell Big Head |
| BHD | Bad Hair Day |
| BHH | Bless His/Her Heart |
| BHL8 | Be Home Late |
| BHM | Big Handsome Man |
| BHO | Barak Hussein Obama |
| BHS | Be Home Soon |
| BIAB | Back In A Bit |
| BIC | Believe It Comrade |
| BICBW | But I Could Be Wrong |
| BIEH | Best I Ever Had |
| BIFFL | Best Internet Friend For Life |
| BING | But It’s Not Google |
| BM | Bowel Movement Black Man BMW |
| BM4L | Best Mates For Life |
| BMAK | Blow Me A Kiss |
| BMB | Bebo Me Back |
| BMBO | Blow My Brains Out |
| BME | Body Modification Ezine |
| BMFE | Best Mates Forever |
| BMFL | Best Mates For Life |
| BMG | Be My Guest |
| BMI | Body Mass Index |
| BML | Bless My Life |
| BMOC | Big Man On Campus |
| BMS | Bitchy Men Syndrome |
| BMT | Before My Time Basic Military Training |
| BMTH | Bring Me The Horizon (Band) |
| BMTTVE | Best Mates ‘Til The Very End |
| BMUS | Beam me up, Scotty |
| BMV | Be My Valentine |
| BMW | Bavarian Motor Works (car manufacturer) |
| BMX | Bicycle Motocross |
| BNB | Bad News Bears Bed ‘N’ Breakfast Bread ‘N’ Butter |
| BNF | Big Name Fan |
| BNI | Batteries Not Included |
| BNIB | Brand New In Box |
| BNOC | Big Name On Campus |
| BNP | British National Party |
| BNR | But Not Really |
| BNWOT | Brand New Without Tags |
| BNWT | Brand New With Tags |
| BO | Body Odour |
| BOAT | Bust Out Another Thousand |
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| BOBFOC | Body Off Baywatch, Face Off Crimewatch |
| BOED | Book of Exalted Deeds ( ) |
| BOGO | Buy One Get One |
| BOGOF | Buy One Get One Free |
| BOGSAT | Bunch Of Guys Sitting Around Talking |