It is a slang word for vagina and is most often used in an affectionate but disparaging way. As in, he's a pure fud, accompanied by a wry shaking of the head.
How the hell do I keep finding vaginas here pretty much all the time, and every time they seem to fit in exactly right????
Its the Scots, they are obsessed with them... Alright then, it's just me... :OD