A slang word originated from the south of England, often used as an alternative word for a pierced bellybutton, or a bellybutton which has an 'outward' facing centre.

Often pronounced using a 'h' sound made by the nose instead of the 'tt'.
EWWWWW!! That tramp has a MELLYMUTTON
by nosyposeygraham July 25, 2010

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