Top Definition
A rare dinosaur which is native to Kansas. This species is identified as near extinct by the TRFZA(That Really Famous Zoologist Association). The last few Sissokosauruses can be found living in Northern New Jersey, recently escaped from the Turtle Back Zoo-West Orange, NJ. The Sissokosaurus has the distinct characteristic of smiling continually, and has been documented as smiling for as long as 84 days and 6 hours.
We were at the frisbee game and all of a sudden a Sissokosaurus came out of nowhere and and Skyed that frisbee nazi!!
by SealingPhan April 14, 2009

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