This is a popular meme. You can find the clip on YouTube just search "Yee". It is from a dinosaur show/film or something like that. The language is originally Italian. A dinosaur is singing a song, and then this other dinosaur that is a T-Rex, interrupts him. He says "Yee" which translates to "Peek". If you don't understand this meme you can check out videos in YouTube which explain it.
—rosythekitty