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1. Slang A person regarded as despicable.
2. Vulgar Slang A condom, especially one that has been used.
[From slang scum, semen.]
slang an offensive or despicable person
[C20: perhaps from earlier US sense: condom, from US slang scum semen + bag]
n., v. scummed, scum•ming. n.
a. a film or layer of foul matter that forms on the surface of a liquid.
b. a film of algae on still or stagnant water: pond scum.
2. refuse or offscourings.
3. a low, worthless person.
4. such persons collectively; dregs.v.i.
5. to form scum; become covered with scum.v.t.
6. to remove the scum from.
[1200–50; Middle English scume < Middle Dutch schūme (Dutch schuim) foam, c. German Schaum]