oocha-mucha-laacha Share definition Flag a weird saying that doesn't actually exist. possibly said by the oompa-loompas of willy-wonkas chocolate factory. "Say something crazy" "Ooocha-mucha-laacha" oocha-mucha-laacha by Evil Scum from planet blobolopogus June 16, 2003 Get the oocha-mucha-laacha mug.