Top definition
a dumb elf, as coined in the movie "Elf"
"i'm nothing but a cottonheaded ninnymuggins"
by dfg January 05, 2004
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2
someone who is not very skilled at their job
by Johnny Depp December 06, 2003
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3
One who thinks he is humorous and/or lacks brain capacity; a doofus
Notice how the two previous posters before me are, themselves, cotton headed ninny muggins's?
by Ctrl April 03, 2006
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4
1) A moron, idiot, dumbass, and overall stupid.

2) A human who accidentally got into santa's bag, and was raised by elves, who because of his human form, cannot make toys as fast as the elves and is inferior.

3) An inferior toy-maker.
Buddy: "Why don't you just say it? I'm the worst toy-maker in the world. I'm a Cotton Headed Ninny Muggins."
Elf: "No Buddy, you're not a Cotton Headed Ninny Muggins. We all just have different talents, that's all."
by AnAsian2010 December 19, 2009
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5
a diss/insult in a funny, babyish way. It adds humer to any harsh fight and you may hear it coming from a whole range of different ages.
your such a cotton-headed-ninny-muggins! what is your problem
by stick it January 01, 2006
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6
Buddy the Elf: "I'm just a cotton headed ninny muggins!!"
by Papa Elf13 December 30, 2011
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7
dumb or foolish. ninnymuggins doesn't really have a meaning.

its a funnier way to say silly
sorry i'm late, my car was being such a cotton-headed ninnymuggins.
by scuba steve December 23, 2004
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