1 definition by Matthew Schanuel

1. Unstoppable. 2. Possessing great efficiency in fragging.

Applied to an individual when he is playing a video game, most likely an FPS (first-person shooter). Usually used as a noun, but can be used as an adjective or shouted by the victor of a game.
That fellow is a true Doomtrain in Halo.
by Matthew Schanuel October 3, 2007
Get the Doomtrain mug.