The name of the company Neo worked for in the movie "The Matrix".
The roots of this word are meta-, which according to Webster's means "going beyond or higher, transcending," and -cortex, which is "the outer layer (boundary) of gray matter surrounding the brain." Thus, Metacortex is "transcending the boundaries of the brain," which is precisely what Neo proceeds to do.
A website that allows users to upload videos for everyone to see, and allows the video-makers the opportunity to receive payment based on the amount of hits they receive.