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
Top Definition
sick minded individual
that person over there is a right smi look wat hes duin 2 that dog
#pervert #retarded #sick son of a bitch #perv #sick guy
by Nicole Hudson June 10, 2006
A word used to describe the loading/percentage of something, particularly 18%
Everyone laughed at him because he only got a low smi of the votes.
#percentage #number #amount #votes #sean
by Clone xoxo June 20, 2011
Smis is the word for smudding and pissing at the same time from your penis/vagina depending.
Dude I just smissed all over teh toilet seat.

Fuck that.
#smis #smud #anus #penis #vagina #anal #semen #sperm
by greatbigflumpkin October 05, 2008
Subject Matter Ignoramus: used to describe a manager or executive who supposedly knows "how to lead" but knows nothing about the actual business or activities he or she is supposed to manage. Pronounced "smigh" -- rhymes with "sigh".

Opposite of subject matter expert (SME).
They've hired a SMI to head up the Roads Department: the guy can't tell concrete from asphalt -- hell, he doesn't even drive.
#sme #expert #know nothing #boss #mba
by Jasper Ferg March 04, 2011
Seriously Mentally Ill, a legal classification in the state of Arizona, referring to a class of individuals who meet certain psychiatric diagnostic and functional criteria.
This person is enrolled in SMI services.

The state legislature is considering additional SMI funding.
#serious mental illness #mental illness #mentally ill #mental #smi
by Arizona Jaguar November 26, 2006
societies most insane
sick minded individual.
represent SMI bitches.
#society #insane #sick #minded #individual
by oreo17 November 02, 2007
the sound an insect makes when it hits the windscreen
zzzzzzzzzzzzzz ... smi!
by reas October 20, 2003
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