Folklor dance "Bugarka" !?

Hello i'm searching for the lyirc of the serbian folklor dance "Bugarka" .

http://www.youtube.com/watch?v=FYGVPvjBX50

There is a short part of the boys it begins at 2:30 i think. i just understand something like ''opaaa, opaa heej!'' ...but i'm quite sure there is more than this xD
so please help me if u know the text or can hear what they are singing..

thx

Opa opa hej hi ha... that's only what I can hear...:S I can't understand the part when the guys say something and the girls respond, but I guess that, that is the exact part you'd like to know... maybe someone else can help?!

Oh dearrr! Of course I don't understand anything... Actually.. they say only a few words after opaaa, opaa heej (and again) opaaa, opaa heej but...

Maybe ask on youtube? I see the author of the video replied to a similar question..