Jopay is a song by the Filipino band Mayonnaise, released in the mid-2000s and widely remembered as one of the group's signature tracks. Online, its intro became especially recognizable because listeners could identify the song almost instantly from the opening notes. That familiarity helped it spread in short-form videos, reaction edits, and nostalgia posts, particularly among Filipino audiences. It still gets reused because the intro alone quickly signals romance, longing, or playful melodrama without needing the full song.