Can someone identify the song in this video?

Dear fellow Bulgarians,

A friend sent me this meme recently and we can’t stop referencing it, but we are unable to find the exact song played in it: https://streamable.com/ybqlre

Can some of the native speakers please confirm whether the spoken language is actually bulgarian at all, and if yes, tell us what is the name of the song or what is it about?

Thanks and greetings from Croatia