SI

Sisteme Internacional

SI units are the best, man. Inches suck.

by AnActualDefinition March 12, 2018

SI

self injury.

cutting, carving, bruising, welting, etc.

you: damn... i hate emos.
me: ......
you: you SI?!?
me: ......

by 341103001 August 29, 2007

SI

Sports Illustrated

I done read SI.

by Andy L August 3, 2003

SI

sexual intercourse sex hanky panky hot hottie awesome cool sexy 1. a word and hand-sign created to refer to sexual intercourse in a way unknown to rejects, spazes, and especially older, uncool adults, so your conversations remain esoteric.

2. this term can take the place of words such as hot, hottie, sexy lady, ect.

3. SI can also replace cool, awesome, ect.

ex1: Things are really going well with my gf. I think SI is an inevitability.

ex2: Whoa! Check her out! SI at 10 o'clock.

ex3: "Hey, there having free food at the party, and there's no addmission price this time!"

"Really? Aw, SI man!"

by Oddjob 007 September 28, 2006

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 September 18, 2005

SI

Level Trim for Honda Civic and etc... it means.. SLOW IMPORT..

That SI got beat by my geo.

by HawkINX4 April 14, 2004

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