Denshi Jisho — Online Japanese dictionary

喃 のう 1: (Usually written using kana alone) (Archaism) excuse me! (when calling out to someone);
2: (Usually written using kana alone) (Archaism) right?; don't you agree?
Interjection 
喋喋喃喃 ちょうちょうなんなん billing and cooing; holding an intimate, long-winded conversation in whispers
Usually written using kanji alone, Noun, Suru verb, Taru-adjective, Adverb taking the 'to' particle, Archaism 

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