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.

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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