The Disco

 was a Head Item in Club Penguin Online. It cost 600 coins in the Penguin Style catalog or the Merch Stand Catalog, during the Music Jam 2018.

Trivia

 * Similar items were the Clown Hair and The Mischief Maker.
 * If you talked to Sensei in Card-Jitsu Fire or Card-Jitsu Water while wearing this, he would have made a comment about the item.