Usually shouted when angry. Great for sarcasm
Nyah nyah! That freakin chachi stole my wallet!
by ohsnapdawg April 13, 2009
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An interjection with a meaning and use similar to "so there" or "eat your heart out".
"You can say what you want but I kicked your butt at that game so NYAH!"
by Rentasmo November 24, 2005
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What Cartman on the show South Park always says in place of words like "here" and "now".
"You can stay over nyah, but I'm going over nyah."

"Yay, I shall answer the phone nyah."
by Dev December 9, 2003
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Used in conjunction with the word "see," Often used by men with curly moustaches wearing a monocle and a black top hat. Sometimes the man also wears a penguin tux. Sometimes the word nyah is even extended to furthur draw out the intensity of the word. Often used while twisting the curled end of the moustache.
Tuxedo'd Man: "Nyah see."

or

Tuxedo'd Man: "Nyaaaaaaaah seeeeeeee"
by Kyond August 8, 2008
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A word that you repeat many times over to 1) annoy the hell out of people or 2) win an arguement
Me: You can't do that Mat
Mat: nyah
me: but you-
Mat: nyah nyah nyah nyah nyah nyah!
me: ok fine
by Britt May 29, 2004
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An interjection indicating displeasure. Supposedly first uttered by a snarky cat.
by Phil McKraken September 25, 2005
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the sound made by giving a kiss, can be used in place of muah to mean you are kissing someone you love;
to use nyah means that you love the one you are sending the kiss to
Sweet dreams baby, nyah (kissing the one you love goodnight)
by ConTravy September 7, 2011
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