Webster's English Dictionary

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scum

1. scum \'sk*m\ \'sk*m-e-\ n [ME, fr. MD schum; akin to OHG scu-m foam] 1a: 
   extraneous matter or impurities risen to or formed on the surface of a  
   liquid often with a foul filmy covering 1b: the scoria of metals in a 
   molten state : DROSS  2a: REFUSE  2b: the lowest class : RABBLE  - scum.my 
   aj
2. scum vi or scummed;  or scum.ming : to become covered with or as if with 
   scum