Top definition
Refers to a cigarette, usually smoked in the company of shady and/or gully individuals. The term "bwain" is derived from "bone", a more common and somewhat less grimy reference to cigarettes.
Shall we retire to the bwainsment for some sweet bwain action?

Dude, I'm bwained out of my fucking mind.

I am so fucking bwained right now.
by Sleeeze Smiff January 12, 2009
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