krepati

1. colloq. (of animals) to die
   Komšijin pas je krepao prošle zime. — The neighbour's dog died last winter.
2. derog. vulg. (of people) to croak; to drop dead
   Radije ću krepati nego mu tražiti pomoć. — I'd rather drop dead than ask him for help.
3. colloq. (of a device) to die; to conk out
   Krepao mi je telefon usred razgovora. — My phone died in the middle of the call.
   Akumulator je krepao, auto neće da upali. — The battery's dead, the car won't start.

The neutral word for an animal dying is uginuti; krepati is cruder.