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English word cocky comes from English cockatoo, English -y
cockatoo (English)
(slang, obsolete) A lookout posted during a two-up game, when gambling was illegal.. A bird of the family Cacatuidae with a curved beak and a zygodactyl foot.
-y (English)
Forming abstract nouns denoting a state, condition, or quality.. Used in the name of some locations which end in -ia in Latin. Forming diminutive nouns. Also used for familiar and pet names as a term of endearment. Added to nouns and adjectives to form adjectives meaning “having the quality of”.. Added to verbs to form adjectives meaning "inclined to".
cocky (English)
(Australia, New Zealand, colloquial) A cockatoo farmer.. (New Zealand, informal) A sheep farmer.. Abbreviation of cockatoo; used when pretending to talk to such a bird, as in "hello cocky".