weedasaurous-rex Share definition Flag One who smokes the amount weed that is the size of a meal for a T-Rex dinosaur. or someone that is very big and fat that smokes a lot of weed. HOLY SHIT!!! look at that huge weedasaurous-rex !!!!! weedasaurous-rex by stonedmothafucka420 September 27, 2009 Get the weedasaurous-rex mug.