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

cutting, carving, bruising, welting, etc.
you: damn... i hate emos.
me: ......
you: you SI?!?
me: ......
by 341103001 August 22, 2007
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
SI
Organization of sensation for use.
A type of therapy effective for children with processing disorders including autism.
therapists facilitate a child's intrinsic understand of body sensations to better interact with the understanding of everything that is not the body
by occupational therapist December 14, 2004
SI
Sports Illustrated
I done read SI.
by Andy L August 03, 2003
SI
Abbreveation of Science and Industry, possibly the most popular Half-Life mod around.
'I'm sorry mum, i can't go and have a bath, im going to play SI'

'I'd rather play SI than CS'
by Anonymous June 26, 2003
Si
An unbelievably rich cunt (richer than Bill Gates) who wears a monacle and probably has other characteristics but none you really care about.

Also likes boys and sniffing the sweatline under fat guys flabbing man breasts.
Brian has loads of money for beer tonight. He could do a Si and buy the pub free drininks all night.
by Bobby Charlton March 18, 2004

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