J-Nabi's definitions

Yat

Yat (yāt) interj. : A combination of the words "Yay!" used for expressing elation, and "What?," resulting in a word one uses when responding to a statement that may demand an excited response, but the responder is unsure as to whether or not they should be thrilled about said statement.

Person #1: "Hey - ! Would you like to go see the new exhibit at the Museum on the Dromaeosauride families - ?!"

Person #2: "Hells yeah ... ! (What's a Dromaeosauride ...?)"

Person #1: "I know! I'm so pumped for this! Yay - !"

Person #2: "I know ... ! Me too!

Person #2: <enthusiastic nervous laugh> Yat ... !

Person #1: "Wooooo !!!" <fist pump>

by J-Nabi July 19, 2010