Cooties

The English term "cooties" appears in early 20th-century military slang, notably among British soldiers in World War I, where it referred to lice infesting trenches. Over the 20th century the term migrated into civilian childlore as an imaginary contagion used in playground interaction. Etymological proposals in the literature include derivation from Austronesian terms (kutu/kuto meaning lice in Philippine, Malay/Indonesian, and Māori languages) and a folk/ironic coinage from "cuties"; sources present these possibilities without definitive proof.

As a playground concept, cooties have no stable visual form — they are an imagined infection with no consistent physical manifestation. Historically the wartime referent was real lice (small parasitic insects) in soldiers' trenches. In modern popular media the concept is sometimes fictionalized (for example, the 2014 film Cooties depicts an invented pathogen that transforms children into violent, flesh-eating figures), but such portrayals are creative adaptations distinct from the childlore game.

Cooties function as social-game mechanics rather than supernatural powers. In childlore a child is said to "catch" cooties through close bodily contact, touching, proximity, or contact with an opposite-sex peer of similar age; this rule-set is used to stigmatize or exclude peers and to codify social boundaries. Children may enact mock immunization or cure rituals (the "cootie shot") to grant or remove immunity within play. The wartime sense referred to the real reproductive and nuisance behaviour of lice; media adaptations attribute biological or violent behaviours to the concept, but such abilities are fictional extrapolations.