Top Definition
A dinosaur that projects a colossal amount of fail unto anyone who comes in contact with it.
Person 1: What the hell is this dinosaur supposed to be?
Person 2: Well that's a fail-o-saurus rex, bro.
Person 1: Well why the hell is it in my YuGiOh deck? This is not a real card.
Person 2: Too bad, bro. You take the card out, you will lose all of your future duels. The fail-o-saurus rex is irremovable.
by locheland December 17, 2009
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