In the videogame Final Fantasy II for the SNES, this is what Tellah calls Edward. It's actually a good example of Nintendo's censorship of games, because the Japanese version had him being called something bad. At least it's comical though.
When someone reaches a non sober state and starts acting in a bizarre and odd fashion. Their facial expressions are in some way retarded and their communicative skills have deteriorated beyond recognition. They are normally smart, friendlypeople who let out their spastic personality hidden within.
Someone is wearing a vampiremask making weird and animal like noises for no particular reason.
One of his friends will then comment saying "look its Spoony Dave."