look up any word, like spook:
 
3.
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.
by greatbigflumpkin October 05, 2008
 
1.
smi
sick minded individual
that person over there is a right smi look wat hes duin 2 that dog
by Nicole Hudson June 10, 2006
 
2.
Smi
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.
by Clone xoxo June 20, 2011
 
4.
SMI
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.
by Jasper Ferg March 04, 2011
 
5.
SMI
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.
by arizona_jaguar November 26, 2006
 
6.
SMI
societies most insane
or
sick minded individual.
represent SMI bitches.
by oreo17 November 02, 2007
 
7.
smi
the sound an insect makes when it hits the windscreen
zzzzzzzzzzzzzz ... smi!
by reas October 20, 2003