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An earworm is a song stuck in one's head. The term was coined by James Kellaris, an associate professor of marketing at the University of Cincinnati. The word is a literal translation of the German Ohrwurm, which is used with the same figurative meaning.
The very brave may visit Badger Badger Badger for an example.
See Meme.
Earworm is also short for corn earworm.