The line comes from Replay, the debut single by British Virgin Islands singer Iyaz, released in 2009 and built around a memorable pop chorus. The phrase about a melody in his head became one of the song's most quoted parts, and short clips of it later circulated widely on TikTok and other short-video platforms. Creators reuse it to signal attraction, nostalgia or an earworm moment, and its simple, singable hook keeps it recognisable even to viewers who do not know the full song.