Top Definition
A tempting activity that should be resisted.
I knew I really shouldn't eat that candy, but it was a sexy no no.

Even though I have a boyfriend I gave that guy my number. He's such a sexy no no!

The window was unlocked, so we let ourselves in since we didn't have the keys. It was a sexy no no, but we didn't get in trouble.
by AlisiaMarie May 26, 2010

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