IIRC = If I Remember Correctly
IIWM = If It Were Me
ILICISCOMK = I Laughed, I Cried, ISpat/Spilt Coffee/Crumbs/Coke On My Keyboard
ILY = I Love You
IMHO = In My Humble Opinion
IMNSHO = In My Not So Humble Opinion
IMO = In My Opinion
INMP = It’s Not My Problem
INPO = In No Particular Order
IOH = I’m Outta Here
IOW = In Other Words
IRL = In Real Life
ISS = I Said So
ITM = In The Money
IYKWIM = If You Know What I Mean
IYSS = If You Say So
J:
J/C = Just Checking
J/K = Just Kidding!
J/W = Just Wondering