Something that zoomers often say, especially popular among females. It basically means the same thing as ooooh and oooOoo or even omg, just with the added benefit of sounding all cutesy and unbelievably cringy n stuff, I guess.
It's an ad-lib and a replacement for lyrics you can't think of. It's very commonly used in today's rap generation.
Something similar to skkrt but "ouu" is user alot more.