Since it's short for "you ones", I suppose it would technically be "you'nes", which of course looks insane and nobody would ever write it that way. I've also seen it written with an apostrophe ("y'inz") which is funny to me - it acknowledges the contraction, but with everything completely misplaced.
summermusic|1 year ago
banannaise|1 year ago
(and yes, I am from western PA)
unknown|1 year ago
[deleted]
was8309|1 year ago
nativeit|1 year ago