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: a school which has a bad middle school principal and becomes gay when in Middle School.
We are a group of SMIS.
by REI. H March 11, 2019
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3
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
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4
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
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5
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
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7
the sound an insect makes when it hits the windscreen
zzzzzzzzzzzzzz ... smi!
by reas October 20, 2003
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