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!
by Last_Assassin January 14, 2004
the king of jerks - total idiot - loser
you're a real jerkasaurus.
by j.bowen January 01, 2007