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1.
High powered, premium stereo system in a car, truck or van, capable of large amounts of bass and treble.
With that system I can hear you a block away.
by jt November 21, 2002
 
2.
Can mean a lot of things. Notably:

Computer system: A somewhat more technical term for describing a rig, usually including a processor, hard disk, monitor, RAM, cards, etc.

A weather system: An area that has an airmass of notably high or low air pressure; can be affected by thermodynamic interactions with the atmosphere, bodies of water, etc.

System: In general, anything that unifies more than one thing or organizes them. Eg: healthcare system, etc.

System (of a Down): System is often used as an abbreviation for the name of this kick-ass band because you want to save time for discussing how awesome they are.
Some guy:
Hey Jim, I just made a new system for getting my homework done so I can check all the high-pressure systems on my expensive new system, while listening to System!
by Stephen P October 30, 2007
 
3.
you are system if you are raw at basketball. and a replacement for swag.
Gavin, you are not system, you are trash.
by rivasquad June 05, 2013
 
4.
#Abbreviation of system of a down
#aka kickass
#Have an album toxicity which is NOT pronounced toxic-city MELLA U TARD
'I love system!'
'System of a down?'
'No..*Rolling eyes*...System of my ass'
by kimmy booth June 07, 2005
 
5.
another word for 'body'
the more drinks in your system, the harder the fight!
by DJ S August 15, 2004
 
6.
Typically to at least a 1/4" by 5" line of cocaine or better.
After I followed that chick in to the bathroom, she floored me when she pulled out a System
by BBlanc March 05, 2009
 
7.
'70s slang for high on alcohol, weed and pills.
I had a good system going on at your party the last night.
by cheetahcub September 20, 2008