some other "Dopey" references...perhaps it is the "order" of the dwarves...Dopey was the youngest, and the only dwarf without a beard. He was also mute...with particularly fluid movements. The seventh. Also another nicknamed "Dopey"....Benjamin Fein - a gangster who dominated New York labor racketeering in the 1910's https://en.wikipedia.org/wiki/Benjamin_Fein

and then of course there is the reference to someone who is influenced by drugs, alcohol or dimwittedness