A wet spot seen on the exterior of a man's trousers after he has urinated but not adequately shaken or wiped his penis, leading to an after-pee soiling of the nearby clothing. The size of the spot usually being reminiscent of a two-shilling, or "two-bob" coin used in pre-decimalised Australia and UK.
Hey Knackers, did you forget to give your cock a good shake after your snakes hiss? You've got a cracking two-bob spot on the front of your dacks there.
by clemstar November 10, 2015