earworm

The chorus [of "Meeting in the Ladies Room" by Klymaxx] spawned an earworm so potent that women still mutter it as they exit for a bathroom break twenty years later.

I had planned in mind to tell you … how I protected, that is, guaranteed, Evergreen sweet corn against the bud worm and the ear worm; …

Earwig, … The ear-worm or grub, a well-known insect, with large transparent wings, which eats fruit and flower-leaves, and has been erroneously supposed to creep into the human brain through the ear; …