GYAH, or you are grounded. Used while texting. Similar to " come home now" and " I'm not joking, get home right now" Typically used when texting a teen who is past his/her curfew
By Taffy
Gyah
Basically when a little anime loli fucker says it when they're taunting a male AKA a Otaku. A great representation can be seen in the manga. "Don't Bully Me Nagatoro." You find this in Chapter 12. It is sorta used the same as fufufu, which is like a cute evil anime laugh. Can also be interpret as a sort of gasp.
Otaku Based Faggot - "Please leave me alone Miss."
Anime loli fucker - "Why don't you make me? Gyah, Gyah, Gyah.