Top Definition
Considered the least attractive of all dinosaurs and the lowest on the food chain during the Cretaceous period.
That hat is as ugly as a Miandasaurus.

Person 1: ''Do you think that animal is uglier than a Miandasaurus?''

Person 2: ''No, nothing can be as ugly as the Miandasaurus''.
by Lukeb182 October 12, 2010
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