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1.
sys
Short for See You Soon.
Guy: I'll be right there
Girl: Okay
Guy: sys
by PhoenixX April 02, 2005
 
2.
sys
This has quite a few meanings.

1: (My Favourite) SHUT YOUR SHIT!

2: Shoot yourself.

3: Slap yourself.

4: See you soon.

Example for the 1st meaning.
Tim: Dude omg i love cod man.. it's like the best game everr!!! i pr0 snipez omg!!

Simon: Dude, SYS.
by Vope July 01, 2010
 
3.
SYS
Slap Your Self
SYS Nigga!!
by TheGreatVirus November 18, 2003
 
4.
sys
Shoot Yourself
Becomming more popular than EYL (end your life) and KYS (kill yourself)
Guy 1: "Dude, you're fucking dumb EYL"
Guy 2: "Ohh look over there, a gun SYS"
Guy 1: "Ok, fine I will"
by kanewtz December 03, 2008