kusur

1. change
   Izvinite, niste mi vratili kusur. — Excuse me, you didn't give me my change.
   Zadržite kusur. — Keep the change.
2. colloq. (after a number: i kusur) and a bit; odd
   Stan košta sto hiljada evra i kusur. — The flat costs a hundred thousand euros and a bit.
   Ima četrdeset i kusur godina. — He's forty-odd.

Loose coins in general are "sitniš"; "kusur" is specifically the change you get back.