One who believes the Flying Spaghetti Monster is the true creator but does not know which Pastafarian denomination is the true church. For example, most Pastafarians believe the FSM sauce is tomato based, where as others believe it is pesto or cream.
Mark: Hey Mary, are you a member of the Church of Alfredo or are you a Pestoinian?
Mary: Neither, I'm not sure if the FSM is alfredo, pesto or tomato based, so I am Spagnostic.
We had a very heated argument concerning the existence of a supreme being – all except George, the shrugnostic, who just sipped his martini with utter indifference.