When a liquid curdles (like milk) it kuhws (koovs) (kuhwer, kuhwed, kuhws, kuhw, kuhwing)
Ugh my lemaonade kuhwed again, i have to make it all over!!
Yappi AKA Yappu doesn't have the kind of meaning you are thinking, Basically it means Satan's Child! Who is a disgustingly terrifying looking creature and not just a child.
Girl #1 "yooo have you heard? There is a little girl who lives down the street and there's a BIIIG rumour going on that she's a Yappi!"
Girl #2 "hm are you sure it's her?" *Turns into Yappi"
Girl #1 *le dead*