Instantly appealing and easy to remember, especially of a tune, slogan, phrase, or design. The jingle was so catchy that everyone was humming it after the first play.
Informal: (of a disease) infectious; contagious. Flu can be very catchy during the cold season.
Informal or dated: tricky or likely to catch one out; requiring care or skill. That’s a catchy question—think carefully before you answer.