Gigantor is the giant robot in the 1964 cartoon series of the same name. Watch the opening theme song.
"Gigantor" had been long used in fandom as both an adjective and a noun in relation to both Sam Winchester and Jared Padalecki. On May 6 2010 it entered canon.
- Crowley: You kill demons. [Gestures to Sam] Gigantor over there has a temper issue about it.
- Dean: I mean, it's your gigantor body and and maybe your brain, but it's not you.