According to Urban Dictionary, 'GYAT', or 'GYATT' is a shortened term for ‘goddamn’ that guys use when they see a girl, usually with a curvy body type, they think is attractive. The term is commonly used within Twitch streams .
It is an exclamation of admiration or appreciation . It is typically used by young men when commenting on the physical attributes of a girl or woman .
Here's an example: "Wow! GYATT! Look at her curves!"
