Top definition
A person with downs syndrome who acts like a dinosaur. They usually copy godzilla when they do it and they run round in circles screaching "I'm a DOWNYSAURUS-REX".
Spaz 1: Heyyy do you want to play downysaurus?
Spaz 2: Mehhhhhhh
Spaz 1: "I'm a DOWNYSAURUS-REX"
Spaz 2: RAWWWWWWWWR
by DoWnYs4JuStIcE April 20, 2011
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