Top Definition
A person who converts from a "human" mentality to a "dinosaur" mentality after extended periods of sleep deprivation. The Twackosaurus has its own mating call and squawk.
Jemerica became a twackosaurus after being up for 72 hours without sleep and began squawking "cooo ca choo" at her dog.
by keithomatic March 15, 2009
7 Words related to Twackosaurus

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