Top Definition
derived from the acronym D.m.m.s.y. (dont make me smack you), dimmsy is a person who

-you want to smack
-deserves to be smacked
-is a complete idiot and would benefit from being smacked.
girls on my super sweet 16
paris hilton
emo kids

Person 1: every one should listen to me! why does no one understand my suburban anguish?
Person 2: youre a dimmsy. (smack)
by axrcr25 April 08, 2010
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