si

Short for "System International." Also known as the Metric System.

The SI system makes more sense than the English system. It should be officially adopted by the US, but we Americans are too lazy for change.

by BlastMaster June 12, 2003

si

Its a model of faster model of the Honda Civic, meaning "Sport Injection"

My civic DX got spanked by that Si hatck.
or
Im bout to get me some Si rimz dawg.

by Tsugaru November 26, 2003

si

Abbr. Simple Simon. Individual renowned for extreme stupidity and slowness of mind.

"Jog on you si - you're as thick as pigshit" or "he's a proper si that one, thicker than a King Edward yoghurt"

by Phileas May 20, 2008

si

synthetic intelligence.

Artificial intelligence derived from synthetic materialism.

SI is the only path to achieve artificial intelligence.

by sandraxine June 20, 2018

si

derogatory term for man who thinks hes a fox.

si, you isnt a fox dude!

by kezza January 30, 2005

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

VERY sweet, cute, attractive, thoughtful, smart, funny young woman found in and around the London area. Keep your eyes peeled but dont touch, she's already claimed ;)

Just think of someone that fits the description above - there's only one person you can think of!

by shiftkis May 16, 2003