Top Definition
A person who has done something dumb. At that moment they are a "nincampoop"

Also can be used to just call someone a retard or dumb.

you can also be awarded nincampoop of the day.

(nin-cuhm-poop)
you just knocked over the bbq! you nincampoop!!!

jebbadieuh totally got nincampoop of the day for breaking the paddle...
on i know... that nincampoop
by pejooshkin September 13, 2007

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