What is "feh"?

I see this on the boards sometimes and can’t figure out what it means.

Can someone clue me in?

It is a general grunt of dismissal or disaproval. It is pronounced exactly as it is spelled.

Wow. That was fast.

Thanks.

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pfffft
bah
tsk

Nu, it’s just a word! Don’t get your tuchis all farmisht. You say it if some goniff or knacker (or even a schnorrer or nudnik) should cause you to shvitz or makes a tsurris. Even a sheygets like me will use it on occasion, when I’m driven meshugge.

Define ‘farmisht’

You can probably guess what that word looked like at first glance.

Okay, vocabulary whiz that I am, now I feel totally inadequate.
What’n the heck do the bolded words mean? I’m assuming Yiddish or something to that effect?

Feh, it’s Yiddish alright. Try here: http://hebrew.about.com/homework/hebrew/library/blyiddisha.htm

“Did someone here say ‘schnorrer’?”
–Capt. Spaulding

Oi! I need to take a dreck.

Feh.