Our crowd made this up 38 years ago when someone said they had no idea what it was called (say a medical term). It is mainly used as an insult: "Bill, you grisnoid!"
Someone who isn't really a bad person but has some social issues especially in larger crowds because they can be just well fuckin' annoying. They tend to be nice to everyone because they well wanna be loved so they tend to be at many social events just being pretty fucking irritating. Basically just a lameass.
"Fuck me, Bewick turned up at my party and he was doing everyone's head in. He's such a Gizzoid"
derived from the word"GIZMO" .an expression used when flustered. A term used in electronics when too dumb to really know what the pieces are called. in actaulity you can call anything a gizmoid, spoken flentley with white trash,hicks,and anyone over the age of 65.