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1.
small patches of short, scruffy body hair that grow on random parts of a person's body, espcially the underchin and upper ass
Hey Brian, shave your filthy ass muffling off the side of your face.
by Kyle Hamlett May 16, 2008
 
2.
The female equivalent of cock blocking.
That girl spent all night muffling me.
by Zenshu November 29, 2010