Procure por qualquer palavra, como cleveland steamer:
 
1.
SI
Abbr. for 'stupid idiot'
As in Football Factory from 2004:
"Jog on, you si!"
por Nige Menzel 24 de Maio de 2007
 
2.
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.
por rieux 27 de Novembro de 2003
 
3.
Si
An awesome boy that is kind, nice, derpy, hilarious and clumsy and is a wonderful bestfriend.
Is that Si?!
por kjj-123 30 de Dezembro de 2012
 
4.
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')
por KainJynez 22 de Junho de 2009
 
5.
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"
por upsidedownchoking 03 de Dezembro de 2009
 
6.
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
por mat a 24 de Abril de 2005
 
7.
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.
por Injuried 07 de Novembro de 2010