SI

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

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
mugGet the SImug.

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
mugGet the SImug.

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
mugGet the SImug.

SI

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

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
mugGet the SImug.

SI

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