A person or a member of a group of people regarded as undesirable and rapidly procreating.
A Tutsi.
A person from New South Wales.
A black or brown straight-winged insect of the order Blattodea.
A reprehensible person or persons.
Semen.
A layer of impurities that accumulates at the surface of a liquid (especially molten metal or water).
A greenish water vegetation (such as algae), usually found floating on the surface of ponds
The topmost liquid layer of a cesspool or septic tank.
To remove (something) as scum.
To startscum or savescum.
To remove the layer of scum from (a liquid etc.).
To become covered with scum.