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
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The act of smashing an item with your head, typically while intoxicated.
He doomtrained that paper towel dispenser in the bathroom.
by AG5 September 6, 2006
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A Doomtrain is an utterly leet person, and he's handsom at that :)
OMG, look at that Doomtrain, he rawks
by Beebo December 27, 2005
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When all lanes on one side of a highway are occupied by vehicles driving next to each other in a line at the minimum speed limit so that no vehicle can pass them. Aptly named due to the ''train'' that forms in each lane. Attempted only by the brave due to the extreme anger and violence it can cause.
Someone is gonna beat that guy's ass for forming a doomtrain in the ultra-fast lane.
by Case in point April 8, 2004
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