be a no-no

To be objectionable or prohibited, as of an action. If you're trying to become friends with this woman, criticizing her style of parenting is a no-no. Talking in the middle of a Broadway play is a real no-no. Hey, I thought you had enough sense to know that bad-mouthing your teammates in the media is a real no-no.

See also:

noes
no-no
no-no, a
a no-no
oughtta
there ought to be a law
There ought to be a law!
there oughta be a law
credit
credit to

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