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
Get the sys neck gaiter and mug.
whenever your friends says some stupid shit tell them sys (snipe you're self) ... don't forget the jk ;)
Friend : he's so ugly. ew. why do you date him. he looks like a burnt chicken nugget.

Me: sys susan :|
by slangmaster321 December 09, 2019
Get a sys mug for your cat Vivek.
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
Get a sys mug for your father Trump.
Syed in Arabic means Honorable. Syed refers to a very respected clan in Arab world i.e. to people who are desendents of the prophet. Most Arabs refer to Syeds for Spiritual healing and prayers. However, there are some individuals who claim to be Syed but are not. Such people bring bad name to the authentic Syeds.

Syed Sahib told me some prayers for difficult times.
I went to Syed Sahib for his blessings.
by CycloneCommerce December 19, 2006
Get a Syed mug for your daughter-in-law Sarah.