The line comes from The Powerpuff Girls, the Cartoon Network series about Blossom, Bubbles and Buttercup, three young sisters who fight crime while dealing with everyday childhood problems. Bubbles, the kindest and most emotional of the trio, is often teased for crying easily, which makes her protest especially fitting. Shared widely as a short soundboard clip, it has become a handy reaction sound for denial, embarrassment and playful arguments in fan edits, memes and short videos.