mechafanboy
An anime fan or fan of sci-fi in general who has an obsession with mecha - generally, anything mechanical. Mecha most commonly refers to giant humanoid robots, but can also refer to body-encasing armor and the like.
See Gundam, Neon Genesis Evangelion or Gasaraki.
Mechafanboy
Someone who gets off on Mecha Anime. See Mecha and Anime in the list.
ie. Matt