It is the noise all girls and the ocasional man makes when they here something of discust and mainly used by high school girls when they here somthing refrenceing sex or something of that choice
Tony: so dude I was wacthing some porn last night.....
Random girl: ewwwwwww
Tony: bicth shut the fuck up when you know you'll be gargaling nuts in your late 20s
Random girl: nods her head and says true