A internet cat video. The video is four minutes of absolute horror, (or cuteness depending of how you see it) of a cartoon cat with a body of a poptart
running through space and shitting out rainbows
. The music is a upbeat Japanese
song that goes "nyan
,nyan,nyan,nyan,nyan,nyan....". There is also extended versions made by fans. One of them is even 59:57 minutes long. You can find all of these videos on youtube
by searching up "Nyan Cat"