Top Definition
An affectionate term used to describe a man who likes other men in a way that he shouldn't. Originates from the use of butter as an alternative form of lubrication. Also commonly refered to as arse pirate, up hill gardener or raving homosexual.
I aint going in that pub there's no fanny, its full of f**king butter boys.
by Adam Gallimore January 30, 2004

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