Sprinkling brown sugar on a girls face while receiving a blowjob. Sugar can be literally brown sugar or brown from other sources.
I was in the kitchen and gave some girl the brown dusty muffin because I ran out of powdered sugar.
by PaulWhatTheHecht July 19, 2008
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When your balls are all old and wrinkly and they haven't been touched in a long time
That man looks pretty old, i bet he has a dusty old muffin.
by Bub4 February 11, 2017
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