uvrnut

1. colloq. weird; quirky; bizarre
   Moj komšija je malo uvrnut, ali je dobar čovek. — My neighbour is a bit weird, but he's a good man.
   Sanjala sam neki potpuno uvrnut san. — I had a completely bizarre dream.
2. colloq. (of humour, mind) twisted; warped
   On ima baš uvrnut smisao za humor. — He has a really twisted sense of humour.
3. (of a bulb, screw) screwed in
   Sijalica nije dobro uvrnuta, zato ne svetli. — The bulb isn't screwed in properly, so it doesn't light up.
4. (of a cable, fabric) twisted
   Kabl je sav uvrnut, ispravi ga. — The cable is all twisted, straighten it out.

In the sense "weird" the word is colloquial and usually sounds milder than "crazy".