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1.
95% of the people who submitted inane definiitions for this web-tionary
by I R STOOPID PEEPULLZ October 02, 2003
 
2.
A person who is of a low intellectual nature.
'Hey, you stupid person, you've just forgotten to go to work.'
by Exleper February 11, 2005
 
3.
Someone who knows better yet is doing or has intention to do something foolish.

Not to be associated with idiot; someone who has a lot of stupid ideas.
That stupid driver ran the light!
or
Look at that stupid person playing the tiger.
by TheGrimWeaper May 26, 2010