Top Definition
A gay day way to say yes. Often sounding like a billy goat when saying it.
Yaas. I love those shoes sis
by Metronig August 04, 2008
An expression of utter and consummate excitement.
It is more powerful than other generic expressions, such as "hooray" or "yay".
Alex: We just finished all of our tests!
Alex (joins in): YAAAAAAAAAAAAAA
Brandon: Can't wait to next period!
Alex: What's that?
Brandon: IST! IST! IST!
by YaaIST March 29, 2010
An absolutely fucking stupid way of writing the word "yes".
Length can vary between "yaas" and "yaaaaasssss", depending on how much of a prick the person saying it is.
Just spell it correctly, you cunt.
Person 1: "Do you want to go for a drink later?"
Prick: "Yaas!"
Person 1: "Scratch that, I'm going with someone who knows how to spell."

Absolute Cunt: "Yaaaaaasssss."
Person 2: "Oh for fuck's sake, just say "yes", 3 letters isn't hard!"
by Killjoy298 January 03, 2016
Abbreviation for Yet Another Account Syndrome; when some crappy little website requires you to make an account to do anything instead of implementing OpenAuth.
I wanted to leave a comment on fuckface's blog, but it suffers from YAAS.
by Skyssx May 06, 2014
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