1978 September 14, “Pilot” (7:32), in Mork & Mindy, season 1, episode 1, spoken by Mork (Robin Williams):
I am Mork, from Ork. Nanu-nanu.
1982 November/December, C. Robert Nelms (letter), “Worth Retelling: Orkan handshake”, in Scouting, →ISSN, page 14:
He reached out his hand to duplicate the gesture of the older Cub Scout and said, very confidently, "Nanu-Nanu."
1997 September 10, Anna Willetts, quoting a vegan, “'Bacon sandwiches got the better of me': Meat-eating and vegetarianism in South-East London”, in Pat Caplan, editor, Food, Health and Identity, London: Psychology Press, →ISBN, →OL, page 121:
Vegan's got a kind of nanu-nanu sound about it. It sounds like you come from a different planet
It was by far the funniest thing I've seen since my half-retarded cousin stood in line at the first Star Wars premiere dressed up in his Captain Kirk outfit, screaming, "Nanu Nanu."
2008 September 17, L. E. Simmons, The Lady of Gold (SnapDragon Adventures 1), 1st edition, Lulu.com, →ISBN, →LCCN, →OL, page 200:
She looked at the speechless cat-girls goggling at her in slack-jacked disbelief and raised her right hand, spreading her fingers apart in a Vulcan "V" gesture. "May the Force be with you," she said. "Na-nu, na-nu."
2001 October 1, Becky Matthews, “The Roswell Incident: Fiftieth Anniversary Sell-Abration”, in Francis Edward Abernethy, editor, 2001: A Texas Folklore Odyssey, University of North Texas Press, →ISBN, →LCCN, →OL, page 98:
The science-fiction tram on pulleys which dangled beside the span of the Fifty-ninth Street Bridge and which Tim and Gabe rode to school and home together every day stood nicely for their resolute and impenetrable best-frienditude: they were freaks beamed daily to the island of Manhattan from their own subordinate, moonlike isle, no wonder they spoke a private language, nanu-nanu, live long and prosper.
