Definitions by Mr_Spybot
M.a.s.
“M.a.s.” or “Mildly Amused Smirk” is a very underused replacement for the much overused “Lol” or “Laugh Out Loud” expression most commonly used online in response to something funny or entertaining. The idea behind it being that most people don't actually laugh out loud or anything close to that when typing “Lol”, therefore the expression “Mas”, “MAS” or “M.a.s” may be used.