Bescummer :: Bescummer (v. t.) To discharge ordure or dung upon.
Scummer :: Scummer (n.) An instrument for taking off scum; a skimmer.
Scumming :: Scumming (n.) That which is scummed off; skimmings; scum; -- used chiefly in the plural.
Scummy :: Scummy (a.) Covered with scum; of the nature of scum.