Has mu kar

Literally to suck me off, used as a insult.
Suck my dick

Someone: you ugly lol
You: Has mu kar!

Kazma

a shovel, used very strong when you work on the field, or a weapon if u happen to threatened somebody

Someone you hate: oh, you are so ugly
You: I will hit you with kazma, don't dare to talk you little shet

Lyubenitsa

bulgarian slang word for watermelon, commonly used in Vratsa region

Someone: Do you want to buy lyubenitsa?
You: Oh, yes I've been craving it so much!