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that person over there is a right smi look wat hes duin 2 that dog
by Nicole Hudson June 10, 2006
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Aug 11 Word of the Day
A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.
"My boyfriend has a total case of brain worms. He told me the cat was bugged so the Feds could listen in on us having sex..."

or

"You totally stumbled over that entire sentence. Can't speak English all of a sudden? What, do you have brain worms?"
by _Jez_ October 03, 2009
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2
: 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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6
societies most insane
or
sick minded individual.
by oreo17 November 02, 2007
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