no-no 

Off limits, not permissible

Sorry, but that's a definite no-no.

no-no by Hercolena Oliver December 30, 2008

no-no 

A baseball game in which no hits were allowed by the pitcher.

That was a nice no-no that Eric threw yesterday. or
Did you see that awesome no-no ballgame that Kevin threw last night?

no-no by SAVern April 25, 2008

No-No 

The word every elementary school librarian uses to describe what you should or should not do with the books.

Librarian: Kids, taking a piss in the books is a big no-no.
Kid: Bu-
Librarian: NO. NO.

No-No by LamarBrames December 12, 2019

No-No 

A No-No refers to a perfect game thrown by a pitcher in baseball. NO hits, NO walks. It is commonly misused to refer to a no hitter in which walks were allowed.

Roy Halladay threw a No-No in the 2010 postseason. He is still a loser for being a Philly though.

No-No by Baseball Expert June 1, 2011

no no

something forbidden, something against the rules(from an essentially juvenile euphemism)

Beards are a no no in the military of many countries.

no no by The Return of Light Joker February 16, 2008

No No

A name I used to call my cousin Noah, Noah, if you're reading this, I'm sorry, I was mean, I was selfish, I was inconsiderate! My tiny brain could not comprehend that you had feelings deep down in your soul, and that I had hurt them, damaged them, ruined them! This is an apology, to you, and any other people who are named Noah, and have a slightly younger cousin who calls them No No!

Hey No No, give me all your monopoly money or I shoot my nerf gun!

No No by FluffyPuppy2011 July 15, 2022

no no

what mommy says when you have done something spectacular

kid: mommy look i hit the neighbor with a baseball bat
mom:no no!

no no by you drink pp March 27, 2003