What is Si?
1.
Abbr. for 'stupid idiot'
As in Football Factory from 2004:
"Jog on, you si!"
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2.
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.
3.
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.
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4.
Abbr. Simple Simon. Individual renowned for extreme stupidity and slowness of mind.
"Jog on you si - you're as thick as pigshit" or "he's a proper si that one, thicker than a King Edward yoghurt"
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5.
"SI" Stands for "Steinar Instebø"
Steinar Instebø was the first teacher to "whip the(<- his ) willy " while the class was having their last exam.
Agent SI is still a teacher at VUS
His name was Agent SI in 2000-2005
He likes younger boys
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6.
self injury.
cutting, carving, bruising, welting, etc.
you: damn... i hate emos.
me: ......
you: you SI?!?
me: ......
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7.
I haven't SI'd in two weeks.