can mean anything you want it to, replaces words such as ridiculous. If you had a really random night out on drugs and then realised you were 70 miles from home you might say that the night turned out to be a bit of a fidooshary.
“Did you have Mr. Schmanganese for senior-level chemistry?”
“Yeah, he bought me some edibles and lululemon shit then said he could give me stoich help.”
“What a fidooche bag!”