An acronym for "Big Fat Blunt", a paper tool utilized to smoke marijuana from. Typically the BFB phrase is employed when a user wishes to get incredibly fucking high.
BFB can further be modified by inserting other adjectives into the acronym, such as a BMFB: Big Mother-Fucking Blunt
Stoner 1: Hey brah, whatchu doin' later on?
Stoner 2: Kickin' it with a BFB - come over and hit that shit!
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