Body-louse

See under louse (def 1).
any small, wingless insect of the order Anoplura (sucking louse) parasitic on humans and other mammals and having mouthparts adapted for sucking, as Pediculus humanus (body louse or head louse) and Phthirius pubis (crab louse or pubic louse)
any insect of the order Mallophaga (bird louse, biting louse, or chewing louse) parasitic on birds and mammals, having mouthparts adapted for biting.
plant louse.
Slang. a contemptible person, especially an unethical one.
to delouse.
louse up, Slang. to spoil; botch:
Miscasting loused up the movie.
Historical Examples

The Ethics of Medical Homicide and Mutilation Austin O’Malley
Gargantua and Pantagruel, Complete. Francois Rabelais
The Book of Humorous Verse Various

noun (pl) lice (laɪs)
any wingless bloodsucking insect of the order Anoplura: includes Pediculus capitis (head louse), Pediculus corporis (body louse), and the crab louse, all of which infest man related adjective pedicular
biting louse, bird louse, any wingless insect of the order Mallophaga, such as the chicken louse: external parasites of birds and mammals with biting mouthparts
any of various similar but unrelated insects, such as the plant louse and book louse
(slang) (pl) louses. an unpleasant or mean person
verb (transitive)
to remove lice from
(foll by up) (slang) to ruin or spoil
n.