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2.
A cool word used by cool people who are excellent at winning everything they do.

It means no.
Person 1: "You suck".
Person 1: "Haha".
Person 2: "Nuh uh".
Person 1: "Wow, your right man".
by Angry Salamander October 10, 2005
 
1.
a word meaning no.
Person 1: is the sky green?
Person 2: nuh-uh.
by Kayla Pape October 15, 2003
 
3.
Noun
A person observed (quite often at the beach) wearing clothing not suited to their figure. Commonly used to describe overweight older females wearing two-piece thong bikinis.
"All I saw at the beach today was a parade of nuh-uhs; it must be tourist season."

"What I like most about West Palm Beach are women in thong bikinis. What I like least about West Palm Beach are women in thong bikinis..."
by thebushmeister July 26, 2005
 
4.
a dumb way of saying no
Andrew is not very bright so he uses words like nuh-uh
by mr. schictel June 07, 2005