A fart that has a lot of bass, as opposed to being a squeeker
Jim: Holy shit Mark, that was one stinky fart.

Mark: Yeah, it was a B Flat.
by CMBC April 07, 2011

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Top Definition
when you don't have a full blown boner
i was looking up her skirt and i got a b flat
by xtimmiex June 03, 2007

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adj: musicians' slang meaning ordinary or common, so-so; unimpressive.
"That restaurant was pretty B-flat; I've had better."
by Slideman October 30, 2006

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt