Top Definition
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!!!
by eyeforaneye May 19, 2009

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