Yaahs- is basically street lingo for white girls. Noun: white chicks, especially valley girls that use the words (like, whatever, OMG bobbi and yaah!) in every sentence.
Yaahs (plural) Yaah (singular)
Dude. how many yaahs numbers did you get this week?
Friend responds: 3. I'm gonna call this yaah named Becky this weekend, rail her and go balls deep son!