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Abbreviation of "lesbisn" - a mis-spelled lesbian.
Seen printed on a cheapo whore-card in soho, presumably the printer (correctly) figured that anyone calling these "girls" was probably not going to be too picky over the spelling.

Has since evolved to encompass a large range of "bisnly" behaviours, including (but not limited to):

- poking ones nose into another person's affairs
- being overly enthusiastic
- displaying a preference for functional outdoor clothing
- being a bit of a girl
- being like a bison
Check that herd of bisns grazing on the plains over there!
by BastardBearBisn October 12, 2010
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