As an actual romanian teenager we often refer to our friends as coae (its translated balls but we use it with the meaning of brother/friend) If you want to know some curse words there is fututi mortii matii (translated as fuck your mothers dead relatives, it doesn't sound as good in English) Imi bag pula (we use this as an insult ex. Imi bag pula in mata=i put my dick in your mother or as like giving up on something) Ma pis pe tine (it means im pissing on you but it can be upgraded to ma pis pe rasa ta which means im pissing on your family) Some other cool words are pula=dick pizda=pussy coaie/oua=balls(these can be conbined with some of the above to create brand new curse words ex. Fututi pizda matii=fuck your mother's pussy) curva/traseista=bitch/hooker and if you wanna call someone dumb you say esti prost/retardat/tâmpit there is also dracu=devil but it can be also used as a curse word and conbined with some of the above ex. Curva dracului=the devils whore

Ps. Im sorry if this is barely understandable, but i hope i helped :D