or.. you can use it call or talk about someone:
That dirty kopele!! - same as: That dirty son of a bitch!
2. Widely used in Sofia among guys since the 1970s; as mentioned previously it is not an insult but rather slang for a man, buddy, etc.
NOTE: In Bulgaria only people from Sofia refer to each other as kopele and only they can use that word on anyone else; if you are from the province and you use the word kopele – first, you would sound ridiculous, second, you would be laughed at and third, you would eventually get a kick in the mouth. Foreigners using "kopele" are exempted from the latter example. ;-)))
2. Kude si be, kopele!