som

1. colloq. (of money) grand; a thousand
   Dao sam dva soma za ove patike. — I paid two grand for these sneakers.
   Koliko košta? — Tri soma. — How much is it? — Three grand.
2. catfish; wels catfish
   Deda je na Dunavu upecao ogromnog soma. — Grandpa caught a huge catfish on the Danube.

In the 'thousand' sense the currency is usually left unsaid and understood from context.