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1.
a wad of cum dripping from your philtrum

and/or

a chunk of feces secretly stored underneath your tongue for fun at parties.
Billie: Dude! are you hiding a plurf in your mouth?!
Chuck: -ppppluuurrrrfffff-

Dannie: Candassce, I think I accidentally gave you a plurf...
by Plurf all night October 23, 2006