Glugging noises like this glu glu glu loop have long been a staple of cartoon sound design, imitating the air bubbles that form when liquid pours or a bottle empties. Online, the clip spread as a short reusable soundboard effect rather than a line from a specific show or character. Creators lift it for drinking jokes, potion scenes, fish tank and underwater edits, and everyday sink moments because the pattern is recognisable even without picture. Its simple repeated shape makes it easy to trim, loop or layer over silent footage.