A term that is used to refer to someone who is being ridiculous, silly, or who is slightly off their rocker. Often used affectionately.
by bits99 May 4, 2021
 Get the Ninnymug.
Get the Ninnymug. by Urbaaaaannnnnnnn May 6, 2020
 Get the Ninnymug.
Get the Ninnymug. Bobert: Wow, that kid that plays runescape is such a ninny.  I stole all his money, ate his girlfriend, and fed him to a boar and he didn't even think twice about it!
Sam: Hey man, wanna play some b ball?
Cheechee: Well, I uh, I kinda wanna play some more runescape.
Sam: You fucking ninny.
Sam: Hey man, wanna play some b ball?
Cheechee: Well, I uh, I kinda wanna play some more runescape.
Sam: You fucking ninny.
by Ninny Barberino December 27, 2006
 Get the ninnymug.
Get the ninnymug. by The Return of Light Joker  December 24, 2007
 Get the ninnymug.
Get the ninnymug. Ninni is the most weird girl in whole school. She get's mad really easily but also forgives easily. She has brunette hair and probably wears glasses. Ninni is not very popular, but still has some amazing friends. She is also very kind and lovely.
she's so ninni!
by gymnasticsforlife September 25, 2017
 Get the Ninnimug.
Get the Ninnimug. by AJ Kash August 20, 2009
 Get the NINnymug.
Get the NINnymug. 