This is the 765th most frequent Serbian word.
пу
The Serbian word "пу" is an onomatopoeic expression used to imitate spitting or to show disgust or disapproval.
Here, 'пу' is imitating a sound a cat might make when feeling provoked or displaying discontent.
Мачка ми је рекла 'пу' када сам је уплашио.
The cat said 'poo' to me when I scared it.
In this case, 'пу' is part of a superstitious phrase used to ward off bad luck or evil spirits.
Пу, пу, да не чује зло!
Poo, poo, so that evil won't hear!
Here, 'пу' is used to mean 'full of' metaphorically, describing the person being discussed as containing both faults and virtues.