I's
IAB - I Am Bored
IAC - In Any Case
IAE - In Any Event
IAMBIC - I'm A Make Believe (imaginary) Character
IC - I See
ICBW - I Could Be Wrong
ICU - I See You
IDC - I Don't Care
IGGNLTL - I Gotta Go Now Let's Talk Later
IGP - I Gotta Pee
IIRC - If I Recall Correctly
ILIC - I Laughed I Cried
ILU - I Love You
IMAO - In My Arrogant Opinion
IMHO - In My Humble Opinion
IMNSHO - In My Not So Humble Opinion
IMO - In My Opinion
IMS - I'm Sorry
IRL - In Real Life
IOW - In Other Words
ISDN - It Still Does Nothing
ISTR - I Seem To Recall
ISWYM - I See What You Mean
ITA - I Totally Agree
ITAYK? - Is That All You Know?
IWALY - I Will Always Love You
IWBS - I Was Being Stupid
IYD - In Your Dreams