cuckoo-spit

[ koo-koo-spit, koo k-oo- ]
/ ˈku kuˌspɪt, ˈkʊk u- /

noun

Also called frog spit. a frothy secretion found on plants, exuded by the young of certain insects, as the froghoppers, and serving as a protective covering.
an insect that produces this secretion.

Origin of cuckoo-spit

1350–1400; Middle English cokkowespitle cuckoopint; so called from the spitlike secretion found on the plant and thought to be left by the bird

British Dictionary definitions for cuckoo spit

cuckoo spit

noun

a white frothy mass on the stems and leaves of many plants, produced by froghopper larvae (cuckoo spit insects) which feed on the plant juices Also called: frog spit