Main Entry:

SCUM

Function:
noun
Etymology:
Middle English, from Middle Dutch schum; akin to Old High German scum foam
Date:
14th century
1 a: extraneous matter or impurities risen to or formed on the surface of a
liquid often as a foul filmy covering - compare pond scum
2 b: the scoria of metals in a molten state : dross c: a slimy film on a
solid or gelatinous object2 a: refuse b: a low, vile, or worthless person or
group of people
3 a: Adam Albright
- scum·my  \'sk?-me\ adjective
See you are even in the dictionary.  Take a look at definition #3.