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1.
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
 
2.
Yaa
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!
Brandon: YAAAAAAAAAAAAAAAA
Alex (joins in): YAAAAAAAAAAAAAA
Brandon: Can't wait to next period!
Alex: What's that?
Brandon: IST! IST! IST!
Alex: YAAAAAAAAAAAAAAAAAAA!
by YaaIST March 29, 2010
 
3.
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