1. Literally, japanese for "iron man"

2. A character from the anime Akira who has a real inferiority complex, and who finally gets to unleash that rage when he suddenly becomes endowed with super-psychic powers. He blows up buildings and stuff, and initiates yet another apocalypse.

3. A really f*cked up movie, perhaps the most f*cked up movie to ever hit the silver screen. Yes, even moreso than Eraserhead. Supposedly has nothing to do with Akira, but this point has been debated elsewhere.