Top Definition
To 'have' ones banjo string snap while 'banking' one 'within' a girl (or boy).

A case of St. Swithin

St. Swithin (or more properly, Swithun) was a Saxon Bishop of Winchester. He was born in the kingdom of Wessex and educated in its capital, Winchester. He was famous for building churches as well as enforcing circumcision within his congregation.
Hey up, my penis is leaking puss after I was Havin-swithen-bank, I need to wrap it up.
by scampy the dog December 13, 2010

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