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
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
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
Socially Inept.

Seen in episode 13 of "Rugrats: All Grown Up"
"Lil, your brother is what he called SI, you know, socially INEPT"
by Johnny Skeets May 29, 2005
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