B-40: A Cigar laced with marijuana and dipped in malt liquor.

Back-crossing: Crossing an offspring with one of the parents to help strengthen a parental trait.

Back-Roll: An English joint, rolled so that only one layer of paper surrounds the mix.
Bag: Term used to describe a 1/4 ounce.

Bake Break: To stop work and smoke a pipe.

Bake Sale: Big smoke session.

Baked: To be heavily ‘inspired’ by smoking.
Bamber: Low or no potency weed.

Barzen: A German term for smoking Cannabis.

Berick : To smoke a bong over six foot high.

Biftah: English word for a joint.

Bikkies: Australian term for biscuits with that special ingredient.

Bitch: One who knowingly sells you bitchweed.

Bitchweed: Adulterated, contaminated, rotten, or otherwise "bad" weed.

Bill-up: UK term for rolling a joint.

Blades: Smoking hashish with a flame and knife.

Blim: The small bits of black left after a good bong session.

Blipped: New Zealand expression for being really stoned.

Blitzed: To be really, really stoned.

Blockhead: UK slang for anyone into resin.

Blow a Stick: to smoke marijuana.

Blow-Back: To exhale smoke into an others mouth.

Blubber: A German Bong.

Blunt: A cigar filled with cannabis (and sealed with honey).

Blunted: To be intoxicated by the herb.

Bob Hope: Dope.(UK rhyming slang).
Bogart: Failing to pass the joint/pipe/bong when your time is up.

Bokin-a-Smowl: "Smokin a Bowl".

Bomber: A joint.

Bone:A joint.

Bong: Waterpipe used for smoking cannabis.

Bongo: Australian term for a bong.

Bongology: The ancient Australian art of water-pipe construction.

Bongineering: One who studies the ancient art of Bongology.

Bottle Tokes: A Canadian term for the method of using hashish where a small hole is made in a bottle (usually beer bottle), then a cigarette with a small chunk of hash on the tip is inserted in the hole.

Bouldered: Australian slang for heavily stoned.

Boxed: English term for having smoked so much that you can hardly walk.
Brekky Bong: First smoke of the day.

Brick: 1 kilogram of marijuana.

Brownies : Traditional.
American biscuit laced with cannabis.

Bucket Bong: Gravity bong, made with a 2  litre plastic bottle and a bucket.

Budiquette : Marijuana etiquette.

Bum : The act of deliberately ruining, or attempting to ruin, one's trip, via intimidation, ridicule, etc.
Bung: Bong.

Burnt Out: To become tired after smoking weed.

Buzz: A mild high.

Buzzed Off: Reaction to bad weed and/or bad trip, resulting in dislike/hostility towards weed and/or stoners.

Buzzed Out : Overindulgence to the point of sleep.