1. Abbreviation for Subaru Technica International, the tuning and motorsports arm of Subaru. Analogous to Mercedes' AMG and Ford's SVT.

2. A model of the Impreza that has been extensively modified by STi. The name STi is used because of the length of the car's real name, the Impreza WRX STi.

3. The poor man's supercar, one which can outrun a Porcshe Boxster in the 1/4 mile and can rip up snow and gravel due to its all wheel drive.

4. EVO killer and the fear of all things Mitsubishi.
"That EVO on the highway got owned by my STi."
by frank carter May 14, 2005
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A sexually transmitted infection.
Hey John I spent hours last night googling STI to get some relief, I cant take this itching anymore.

Its it Ironic how the owners of stirelief.com cant get rid of their site.
by eldudebrothers May 31, 2011
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STI stands for symptom-targeted intervention, a focused, active, individualized approach that social workers can use to teach patients brief, effective ways to cope with difficult thoughts, feelings and behaviors using evidence-based interventions
Once a patient engages in the STI process, the clinician can help them with a number of specific concerns, from sleep and stress to pain management, relationships and mood management.
by doradee February 11, 2015
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Jim: Yo, Korea! Starcraft sucks!
Korea: RRRRRRRRRRRRRRRRAGE!
Jim: STIS!
by Ban-Ki Moon November 5, 2010
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Scandalous Type IndividuaLs: Alameda, California gang...
"All them mutha fuckas rollin' hella deep they all got dreds" "They up in STI..."
by Pimptress December 17, 2003
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1) She hella mean and if your bootsy she'll tell you , she a STI
2)They stay geesin , no wonder they some STIs'
by Bossy-1 July 27, 2006
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The congrigation of Idiots, for the common goal of murder,violence,and hoe pimping. known to the common man as the saint idiots
Hey jim, STI just killed my family. ;(
by Adam November 14, 2004
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