feh, like almost all other Yiddish expressions,
somehow manages to embody exactly what it is meant to get across and
compliments the English language beautifully. It is enhanced by
flipping your hand out in disdain as if you are tossing away whatever comment was made that displeased you.
My mother uses this often but
excruciatingly well.
See also:
incorporate Yiddish into your everyday life