The phrase has various uses, its usually used as a "Fuck you" or a "Fuck off".
Great phrase to start a fight. But the phrase can also be used lightly with no real meaning.
Mare: Whats u faggot?
Djole: Ma "Pusi Kurac" moj debeli.
Puši Kurac actually means i love you in the Croatian/Serbian/BiH language, so if you ever want to tell someone "i love you", say "puši kurac" and watch their reaction
Girlfriend: " Aww babe, you are so sweet, i love you"
Boyfriend: "No babe, puši kurac :) "
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"