1 definition by Mister Slippery
SSTS is Message Board or Chat shorthand for "Snickering Softly To Self" in the same vein as LOL which is message board shorthand for "Laugh Out Loud"
Posting SSTS in a message or chat usually means you are too jaded to LOL and hold everyone else in sophisticated disdain.
by Mister Slippery April 28, 2007