Someone or something that is acting without common sense.

A stupid action.
In class:
*Student walks up to the white board in the middle of class and draws a smiley, then sits down without being seen*
Teacher: "WHAT NIMNODE WOULD EVEN THINK OF A STUPID IDEA LIKE THIS TO DRAW A SMILEY IN THE MIDDLE OF CLASS!!?!?!??!?!?!"
by hamster101 August 01, 2011

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