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A Simasaurus can be defined as a dark-haired female.
It is common for a Simasaurus to lash out unexpectedly, usually at a "Seamasarus" (See Seamasaurus ). A Simasaurus is usually kind and considerate, but when a Seamasaurus or a Seamasaurus look-a-like is near, a Simasaurus will become aggressive, and lash out at both the Seamasaurus and friends of a Seamasaurus. It is never a good idea to have both in the same room.
Ex. 1: "OhHotDamn, look at that Simasaurus!"

Ex. 2: "Crap! A Simasaurus walked in, better get Seamasaurus out of here..."
by LetsGetKinky May 19, 2011
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