8
Severely mentally impaired. Someone who is retarded as shit and can help it.
what are you doin' smi? Hot carls go on another person, not yourself
by john schlongo August 22, 2003
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9
SMI (So much incommon)
SMI (So much incommon)

To refer to a person whom you have much incommon with.

Example: "You are my SMI!"

( FoxtrotSnow )
by FoxtrotSnow March 06, 2017
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