Short for slop-o-dopsauros. When one gets incredibly inebriated, sloppy, or schnazzered. In this process of intoxication, the inner beast comes out. One trots along as if they own the world, while using such a booming voice individuals miles away can hear it clearly. Despite the feelings of greatness when one is slop-o-dop, they are in reality going to pay the next morning with a hangover and a discussion of embarrassing actions.
Dude, she was so slop-o-dop last night she was slurring her words and yelling about sloppy vaginas.