cockroach

noun

1. Any black or brown straight-winged insect of the order Blattodea that is not a termite.

   “Then there were cockroach hunts; we chased them out of their haunts, where at night they busily devoured currants, jam, and sugar; in fact their diet was far more varied than ours, for they made plentiful meals off our boots, the coverings of our books, and any stray pieces of flannel that came in their way.”

2. (derogatory, slang)Term of abuse.

   “I want a divorce, you cockroach!”

3. (derogatory, offensive, slang)A person or a member of a group of people regarded as undesirable and rapidly procreating.

   “During the Rwandan genocide, Hutu genocidaires labelled Tutsis as cockroaches and called for their extermination.”

4. (Australia, derogatory, especially, humorous, slang)A person from New South Wales.
5. (Australia, obsolete, slang)A hard lump of brown sugar.