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The alien life energy source that was ill suited to cope with the vicissitudes of human depression. Credited to the late Robin Williams reprised in his role as Mork from the oft times hilarious TV Sitcom "Mork and Mindy", 1978-1972
"I just cannot wrap my head around this, it's as if his Nanu Nanu went from white hot to a flicker...go figure. Ya gotta admit, the guy had an amazing run".
Nanu Nanu by RAEGUN SPARKS August 14, 2014
The art of suprising your big black date by shoving your index and middle finger in her coot and leaving your pinky and ring finger to do some dirty poo mixing in her chocolate starfish.

AKA the shocker plus the pinky to keep your ring finger company on the dirt road.
Donny loves to apply the nanu nanu to milfs and then clean the tootsie roll colored treat from under his pinky fingernail.
nanu nanu by milf hunter January 16, 2004
The name of the head tribe in the land of Nu. They roam the Grasslands in the center of the land and lead all the other tribes and run the high council. They are known for there ferocious warriors who fight with pride and honor. They use war chants to scare their enemies away before they have even started fighting. These chants are known as 'the screams of the ancestors". The Nanu's leader- The King of Nanu was the creator of the charter in 507BCE. The Nanu's allies include the Ralulu's the sea tribe, the Ululu's the mountian tribe, the Shabado's the rainforest tribe and the Naru tribe from the desert. Their enemies include bandits and the fakers who call themselves "the new Nanu King". The language of the Nanu's is known around the globe for being the hardest toungue to learn. It involves breathing in while using the deepest parts of the vocal cords.
e.g. "That guy could be in the Nanu so don't mess with him."

"I heard the Nanu's penises are 15inches long"
Nanu by a lover of nanu May 13, 2013
means "baby"
if yelled out in public by oneself, the other will most likely run in shame
also means "best of friends that are THE SHIT"
nanu by imjustpeachy January 22, 2011
maternal grandmom in bengali
Hi nanu, I missed you a lot.
nanu by 25541 June 29, 2010
A common misspelling of the word "baby" this should not be laughed at as many do it.
Scott: I love you nanu.
Danni: L O L nanu wtf?
Scott: Baby* chill -.-
Nanu by scott_91 January 12, 2009