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To be adorable, cute, lovable, dreamy and sweet. Nono can also be used as a singular for the name of ones childhood toy.
Example 1: Shannon had such nononess

Example 2: Kholi showed a lot of nononess

Example 3: Victoria (a girl who also pertained much nononess): "I can't sleep without my nono!"

Boy: Oh wow that girl, such nono so many feels
by Bluejasminepuspus February 09, 2014
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