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1.
contraction of the words smart and pretty
-that girl is really pretty and she knows a lot about science.

- She is a real smetty girl
by Sensasion July 15, 2012
 
2.
A person with bad personal hygeine, has oily hair, or dirty fingernails, or yellow teeth for example.
I cant believe he's dating her, she's so Smetty my dog wouldn't even sit next to her,
by Amy B May 17, 2007