Supercalafragalisticexpialadocious... Jesse's girl... Who let the dogs out... Wake me up before you go-go... Never going to give you up... Achy-Brakey Heart... Single ladies... Copacabana... Jut what makes that little old ant (High Hopes)
Maybe your character has something stuck in the head, maybe your character loves to stick them in the minds of other people.
Give me your earworms, and then make some words.
Oh, and...