what's the definition of scum?
The noun SCUM has 2 senses: 1. worthless people. 2. a film of impurities or vegetation that can form on the surface of a liquid. Familiarity information: SCUM used as a noun is rare. â¢ SCUM (verb). The verb SCUM has 1 sense: 1. remove the scum from. Familiarity information: SCUM used as a verb is very rare.