blejati

1. slang to hang out; to loaf around
   Sinoć smo blejali kod Marka do dva. — Last night we hung out at Marko's till two.
   Ajde da blejimo malo na keju. — Let's hang out on the quay for a bit.
2. colloq. derog. (+ u + acc.) to gape; to stare blankly
   Šta blejiš u mene? Pomozi mi malo! — What are you staring at me for? Give me a hand!
   Ceo dan bleji u telefon. — He stares at his phone all day.
3. (of sheep) to bleat; to baa
   Ovce su blejale celu noć ispod prozora. — The sheep were bleating under the window all night.
   Jagnje bleji jer traži majku. — The lamb is bleating because it's looking for its mother.

In the sense "to hang out" it is a very common youth word in Serbia.