Top Definition
when one has failed to shake off properly after emptying their bladder; a piss stain is left that soaks its way through to the trouser front leaving a circular stain.
" mate look over there your dads got a richy b!"

" she said it was the biggest she'd ever seen then got up and left. i couldn't believe it, i had a richy b the size of a golf ball."

" remember to always have an extra couple of shakes, don't wanna go around with a richy b."
by richy.b January 15, 2012

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