SI

Abbr. for 'stupid idiot'
As in Football Factory from 2004:
"Jog on, you si!"
by Nige Menzel June 11, 2007
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SI

Abbr. for "self-injury," also known as self-mutilation. Most common form is cutting, but may also include burning, bruising, skin-picking (excoriation), and other behaviors. There is no single cause for SI. SI is most common in women and tends to persist for years.
As a result of overwhelming anxiety, she turned to SI as a coping mechanism.
by rieux November 27, 2003
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SI

stands for self-injury. Aka cutting, burning, etc. for emotional distress reasons
Person 1- Did you SI today?

Person 2- I haven't hurt myself on purpose in like a week.
by Injuried November 08, 2010
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SI

1. Spanish for "yes."
2. Misspelling of "is."
1. "I suck." "Si."
2. "NO YUO FAGOT A COMPUTAR SI NOT A HAT!"
by Dj gs68 September 22, 2003
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SI

I haven't SI'd in two weeks.
by Anonymous Ex-cutter June 21, 2003
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SI

SI is the abbr. of stupid idiot , although it can also be used in a way in which it means mug
I.E. billy you fucking si, si does not mean sigh which means you bore.
by jake lowe February 11, 2008
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SI

SI units are the best, man. Inches suck.
by AnActualDefinition March 12, 2018
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