A person who consumed a tremendous amount of DXM-containing cough medicine and has had a dissociativepsychedelictrip so intense that after coming down, they believe that they are stuck, still dwelling in the dextroverse. They seem to act very strange or crazy (robo "loony") to normal society, due to their completely different perspective on reality.
roboloony: *high pitched grunting noise*
guy 1: "What's up with that guy?"
guy 2: "Oh that's Alex. He took way too much DXM and now he's just a roboloony."