Video shows what jay means. Any one of the numerous species of birds belonging to several genera within the family Corvidae, including Garrulus, Cyanocitta, allied to the crows, but smaller, more graceful in form, often handsomely colored, usually having a crest, and often noisy.. Other birds of similar appearance and behavior.. A dull or ignorant person. It survives today in the term jaywalking.. jay synonyms: Jenny jay, jay pie, k, kae, bluejay, whisky jack. jay pronunciation. How to pronounce, definition by Wiktionary dictionary. jay meaning. Powered by MaryTTS