The sound comes from Shrek, the 2001 animated film in which Shrek tells Donkey that ogres are like onions because both have layers. In the Portuguese version, the word for onions is cebolas, and this clip isolates that single word from the exchange. The layers joke became one of the film's most quoted moments, reused in memes, edits and reaction videos long after its release. Its brevity makes it easy to drop into new contexts, where the reference still lands for audiences who grew up with Shrek.