SSTM

Silently Smiling To Myself. A more subtle form of lol, as opposed to laughing out loud, one simply enjoys a quiet grin. The acronym can stand for "Smiling Silently..." as well.

AveragePersonA: Check out this funny video, lol!
AveragePersonB: Yeah... SSTM.

by ubershmekel July 04, 2010

SSTM

Smuggly Smiling To Myself

Person 1: Camden Market is burning!
Person 2: SSTM! :P

by STEVENAGE ROGER February 09, 2008