Etymology
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cootie (n.)

"body louse," 1917, British World War I slang, earlier in nautical use, said to be from Malay (Austronesian) kutu, the name of some parasitic, biting insect.

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Definitions of cootie

cootie (n.)
a parasitic louse that infests the body of human beings;
Synonyms: body louse / Pediculus corporis
From wordnet.princeton.edu