Top Definition
South In Your Mouth.

Unofficial Battle Cry for University of South Alabama athletics. Literally means "in your face," but since "mouth" rhymes with "South," the chant is "South in your mouth."

Has been in use by students and fans of South Alabama sports since around 2001.
Goooooooooo JAGS! U-S-A! South in Your Mouth (SIYM)!
by panthera onca September 15, 2010
3 more definitions
Abbreviation: So is your mom
A: That was soooo last month
B: oh yeah...SIYM
by gotcha_eldon August 04, 2011
salt in your mouth
"yo im so salty right now"
by siym April 01, 2010
stands for Satan Is Your Master, common phrase uttered in your ear to sound like youre a psycho. Also combined with KYSF.
(sneak up behind someone): SIYM Satan is your master, KYSF kill yourself fag!

(victim): fucking shit im going insane, gotta slash my wrists to release the pain!

(fuck yes)
by A. K. December 07, 2006

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