SI
Abbr. for 'stupid idiot'
As in Football Factory from 2004:
"Jog on, you si!"
von Nige Menzel 24. Mai 2007
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.
von rieux 27. November 2003
S.I.S is an acronym for Special Investigation Section.

It is an Los Angeles Police Department's elite tactical detective squad with a straightforward mandate: Track down the City’s most dangerous offenders and take them off the street. S.I.S. are possibly the hardest-working, most dedicated men and women Detectives to wear a badge.
Alonzo: Hey, Mark, where are you transferring to?
Mark: S.I.S.
Alonzo: Yeah, S.I.S. Detective.
(from 'Training Day')
von KainJynez 22. Juni 2009
Si
An awesome boy that is kind, nice, derpy, hilarious and clumsy and is a wonderful bestfriend.
Is that Si?!
von kjj-123 30. Dezember 2012
when text messaging, it is used for the idiots who don't understand that you're being sarcastic; means "sarcasm implied," and is often used at the end of a text message.
Janet: "Do you think Miguel was being serious?"

Miguel's text: "yeah i'm really excited to see you too (s.i.)"

Ted: "Of course not, he even put 'sarcasm implied' in the text! You must be really dumb"
von upsidedownchoking 3. Dezember 2009
Means to "sit in silence" insetad of lol. Usually used if somebody sais something retarded online, its a good way to be honest. Lets face it very few actually laugh at stuff online.
xXihateyouxX: i was like "duhhhhhhh" haha
ay u guys 2003: s.i.s
von mat a 24. April 2005
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.
von Injuried 7. November 2010

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