Synonymous with crap. Used when you feel like something went wrong. Not a very known word. No one knows the true meaning, so when asked what it is, you walk away, head hung low.
Fredrick: "Guess what Ryan!"
Fredrick: "Your girl, Maggie Florence was caught making out with Joseph Hemmings, last hour in Mr. Hendrick's class"
Ryan: "WHAT?! That's straight shindookie, yo. How could she--"
Fredrick: "What. On. Earth is 'shindookie', Ryan?"
Ryan: "Uh, how could you NOT know?"
Fredrick: "Call me stupid, but that's the first time I've EVER heard of that."
Fredrick: "Okay, you're so smart, tell me what it means..."
Ryan: ::Phone rings:: "Um--Gotta take this, dude!"
Fredrick: "You're such an idiot."