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

derogatory term for man who thinks hes a fox.

si, you isnt a fox dude!

by kezza January 30, 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

si

Abriviation for suck it, normally used on MMORPG's to make fun of the loser.

Oh, man! Did you just see that head shot? Bet you didnt see that coming loser! SI n00b! Better luck next time!

by Nicholson L. May 17, 2006

Si

SI : meaning ha ha ha(in a sarcastic tone)or your not very smart
randomly made up on the spot because someone mispelt my name so i said si (because that was the bit they missed out) he said "what?" so i carried on saying si just to make him feel like he'd missed out on something. now it is a word! i hope:)

someone makes a joke about you thats not very funny you say "si si"
OR
someone answers a question wrong you say "si" and laugh

by Hannah macintosh April 11, 2004