A very large jerkoff-half dinosaur like human of the Upper Cretaceous Period of North America, characterized by having strong wrists and a large head. Also know to some Canadian dwellers as jerkoffskie
Jerkasaurus is owning up!
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A person who has exhibited abnormally large amounts of rudeness or has said something especially heinous.
Kelly walks into the room...
"Well hello Kelly McFatass! Quick grab a chair! Outta breath already, aren't ya?"- Ian
"Ian you are a jerkasaurus!!!"- Kelly