The only person badass enough to survive the destruction of Installation 04 without escaping. Not much is known about him, other than the fact that he is SO badass it doesn't even surprise Cortana or The Chief that he is still alive. He was mentioned at the end of the First Person Shooter video game "Halo", developed by Bungie Studios.
Also, the act of doing something incredibly kick ass or ballsy, similar to Leeroy Jenkins or Chuck Norris.
A 23-minute epic by psychadelic act Pink Floyd. It's featured on their 1971 album Meddle and is considered by fans the point in which they found the sound they were best known for in albums like The Dark Side of the Moon and Wish You Were Here. It takes up the entire b-side of the album. Also the title of their greatest hits album Echoes: The Best of Pink Floyd (The song is featured on that compilation but is shortened to only thirteen minutes).