What is an ear worm?

ear worm (ɪərˌwɜrm/ [eer-wurm])

 

 noun: a catchy little tune, with some sophistication, the sort you sing along to, whatever the location.

 

verb (used with object): to burrow into your mind: The Ear Worm song has earwormed into my brains.

 

origin: 1980–85; loan translation of German Ohrwurm  ‘catchy tune, very danceable, must buy’