βρε [vre] is an exclamation
usually denotes surprise
βρε-βρε-βρε!!! (surprised by seeing someone)
βρε καλώς τον (την)! [vre kalos ton] (hey welcome! as if you didn't expect him (her) to come or he (she) was too late)
βρε αμάν! [vre aman] (surprised or worried about something)
βρε σύ! [vre see] (hey you!)
έλα βρε! [ela vre] (come on!)