blenuti

1. colloq. (often + u + acc.) to gape; to stare blankly
   Šta si blenuo u mene kao da me ne poznaješ? — Why did you gape at me like you didn't know me?
   Samo je blenuo u ekran i ćutao. — He just stared blankly at the screen and said nothing.

The word is rather blunt and often sounds like a reproach («Šta bleneš?» — "What are you gawking at?").