The chant comes from Ah Lelek Lek Lek Lek, a Brazilian funk carioca track by MC Federado e os Leleks that went viral online in the early 2010s. Its video of young performers dancing and repeating the hook helped the phrase spread far beyond Brazil as a shareable party chant. The lek lek refrain became a standalone meme sound, clipped from the song for edits, remixes and reaction videos. It remains popular because the rhythm is easy to recognise, loop and place over any upbeat or ridiculous moment.