An appallingly thick, porn style mustache, usually groomed from the depths of hell that usually rests above the lips of cops, pedophiles, gays, or cops. Can be used simply as duster, in reference to dusting another mans penis as it is inserted in the duster's mouth.
Damn Barry, did you see Todd's Peter Duster, I bet he tickles plenty of cock with that hairy beast of a mustache.
by Boombox Branson October 4, 2014