cockroach -
An unhygienic person or a member of a group of people regarded as unhygienic or rapidly procreating.
Wikipedia
Cockroaches are insects of the order Blattaria. The name derives from the Greek and Latin names for the insect. There are about 4,500 species of cockroach, of which 30 species are associated with human habitations and about four species are well known as pests.
OmegaWiki Dictionary
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cockroach The most primitive of the living winged insects.