It is a long-refuted chauvinist
claim that when women say "No", they really mean "Yes". What women really
say when they actually mean "Yes" but are too inhibited
to admit it is "Nah", often following a surprising degree of openness
. As in:
Alice: Our sex life is so boring! What I would really like, Frank, is if you tied
me up, gagged me and spanked me to exhaustion!
Alice: Nah ..
Be careful, though, "Nah" is also used in a derogatory fashion, meaning "not a chance", as in:
Bob: I will be your willing sex slave, mistress! Whatever you command, I will do
Alice (looks into his pants): With a three-inch-tool? Nah ..
NAH also happens to be the airport code for Naha, Indonesia.