Top Definition
A large lumbering animal with an extended stomach and a lifespan of about nine months. Animal is prone to ligament pain, especially as it reaches maturity. Know for uncontrollable mood swings, strange eating habits, and a cooing noise made when near children's clothing.
The pack of pregnasaurus waddled into the baby section of the department store and began making strange cooing noises. Spectators were amazed by the gentle nature of the pregnasaurus until one became ferocious with hunger and proceeded to hunt and devour a candy bar.
by Pregnasaur July 30, 2009

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