The phrase comes from French youth slang where moula means money, and chui is shorthand for je suis. As a sound, it circulates as a tiny bragging meme in French-speaking TikTok and short-form edits, usually captioned with the same spelling. Its appeal is the brevity: just over a second long, it works as a reaction to any flex, win or ironic broke joke. Because the wording is so distinctive, viewers recognize it instantly even without context, which keeps it in rotation for money humor and glow-up posts.