What is N.a?
N.A (said 'N-A') stands for not acceptable. It is mainly used as an interjection or adjective to describe things that are not socially acceptable, or actions that are weird, bizarre, or simply inappropriate in a give situation.
That guy just smacked my ass. N.A!
Ugh. Look as those two making out during class. N.A!
It is so NA for you to wear that outfit tonight.