40-b 

to chill, mellow out, or kill the noise. Mainly used by Piru members

Youngin, 40-b dat or i'll put u down, ya feel me?

40-b by Otto Mars January 29, 2008

b-40 

a b-40 is when you smoke a blunt with a 40.0z

lets cop a b-40 and fuck sum niggas up

b-40 by shut up nigga June 12, 2003

B-40 

a slang term used to desribe the act of smoking a blunt(cigar,black and mild,phillie, etc. filled with marijuana) and either drinking a 40 oz. alcoholic beverage with the blunt or dipping the blunt in the alchohol itself.

Let's hit up a B-40 tonight dog and get messed up.

B-40 by d.roc January 4, 2007

Vitamin B - 40 

Large bottle. around 40 oz. or less. that has Malt, Hopps, Barley or Rice.

for all the stress in our adult world ue always can enjoy a bottle of vitamin b-40. Get some Vitamin B - 40 will keep the doctor away.

Vitamin B - 40 by Edger II June 1, 2006

b-40 

A cigar laced with cannabis and dipped in malt liquor

We smoked a b-40 together

b-40 by Nathan Heller April 12, 2006

B-40 Day 

Occurring every year on May 20th when a B-40 must be done by all people willing to celebrate. A B-40 is when a person smokes a blunt and finishes a 40 oz by himself or herself. It is believed to have originated in Staten Island, NY but this fact is uncertain and only rumored, there is no physical evidence of its origins.

yoo it's May 20th you know what that means?? it's B-40 day!!! let's all smoke a blunt dolo and drink a 40 by ourselves!!!

B-40 Day by eyeforaneye May 20, 2009

let that 40 bang 

The gangsta term for poppin a cap in a niggaz ass

If i see these niggaz run up on the block ima let that 40 bang

let that 40 bang by Flying donut hole August 21, 2016