It is social media shorthand for -Shitting in My Pants Laughing-

Used for when LOL and LMAO are just not enough to express how hilarious Someones fucking post, statement or picture actually was.
someone posts "Whats the difference between Michael Jackson and Neil Armstrong?
Neil was the first to walk on the moon and Michael likes to fuck little boys"
You reply "SIMPL"
by Cur See OHHH September 09, 2016
Get the mug
Get a SIMPL mug for your grandma Rihanna.
acroynm for shitting in my pants laughing...when LOL and LMAO just can't capture the hilarity of the moment!
Dude, that is freaking hilarious!! OMG!! SIMPL!!
by compfixr July 01, 2008
Get the mug
Get a simpl mug for your dog Paul.