there is a thing that you use to describe a person which is not really fat, neither skinny. just.... "chubby". it's a term used to describe someone that really gets ofended by the word... fo the one you call "grasuc" he will most likely swear you back or go all emo and cry in a corner.
fututi gura matii de grasuc = fuck your mother's mouth you chubby boy
bai grasucule, o sugi? = hey chubby, you sucking it?