kuhw

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!!

xoarf

Cough and barf at the same time creating a XOARF sound

*XOARF!* Did you just XOARF?

Yappi

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*