Wah

In Diné (Navajo) culture it is an expression used to acknowledge something in disappointment and/or apathy, or even in a comedic condescending way.
It can be prolonged to “wahhh” depending on context and how the user decides to use.

Rez dude - “Hey did you hear your uncle so-and-so picked up a new ride?”

Rez chick - “No huh uh, what did he get?”

Rez dude - “don’t even know, it’s an old used truck.”

Rez chick - “Wahhh”