Machinima is a relatively new art form sweeping through the subcultures of America.
But what the hell is it exactly?
According to the pop culture site Newsarama.com, Machnima is:
movies, short and long form, created using an existing 3d environment; most often with video games used as the base. The most famous Machinima (pronounced muh-sheen-eh-mah) is probably an ongoing series of web shows and movies called Red vs. Blue. These productions are filmed using Halo 2 (and now 3), then dubbed over with full scripts to tell the story.
In case that explanation doesn't give you a clear picture on Machinima, here's a look at one of the films: