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It's basically the opposite of 'yas'. Like every person is gonna use it to express their disguist, dislike.

Like it's gross, pathetic or you just don't like it.
Obviously it's the short form of 'yas' (the word from the gay culture and Gaga's fans that every straight girl says) + NOT.
-OMG HAVE YOU SEEN EMMA'S NEW BOYFRIEND?
-YES GIRL. IT'S soOOooOo YASN'T! EW!
by Saebii May 11, 2017
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2
yasnt!

a southern term,

"you ain't seen nothin yet"
yasnt seen nothin yet, said marie to kylie

kylie said to jason, "you ain't seen nothin yet"

"you ain't seen nothin yet", said the kopyright liberation front
by SUPAHIGHWAY April 25, 2013
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