G

< G > - Grin (add < > for bigger grins)
G2G - Got to Go
GA - Go Ahead
GAC - Get A Clue
GAFIA - Get Away From It All
GAG - Get A Grip
GAL - Get A Life
GAS - Greetings And Salutations
GBH - Great Big Hug or Grievous Bodily Harm
GF - Girlfriend
GFN - Gone For Now
GG - Good Game
GGL - Giggle
GIGO - Garbage In, Garbage Out
GIWIST - Gee, I Wish I'd Said That
GJ - Good Job
GL - Good Luck
GLGH - Good Luck and Good Hunting
GM - Good Move
GMTA - Great Minds Think Alike
GOLL - Getting/Got One Long List
GR&D - Grinning, Running and Ducking
GTG - Got To Go
GTH - Go To Him/Her
GTH - Go To Hell
GTSY - Glad To See You
GYPO - Get Your Pants Off

H

< H > - Hug
H&K - Hugs and Kisses
HAGD - Have A Good Day
HAGN - Have A Good Night
HAGO - Have A Good One
HAND - Have A Nice Day
HB - Hurry Back or Hug Back
HF - Have Fun
HH - Holding Hands
HHIS - Hanging Head In Shame
HHOJ - Ha Ha, Only Joking
HHOK - Ha Ha, Only Kidding
HHOS - Ha Ha, Only Serious
HIWTH - Hate It When That Happens
HOAS - Hold On A Second
HSH - Home Sweet Home
HTH - Hope This/That Helps
HWISTKT - How Was I Supposed To Know That

I

IAC - In Any Case
IAE - In Any Event
IAGW - In A Good Way
IANAL - I Am Not A Lawyer
IBALD - It's Been A Long Day
IBM - Inadequate Business Management
IC - I See
ICBW - I Could Be Wrong
ICQ - I Seek You
ICYDK - In Case You Didn't Know
IDGI - I Don't Get It
IDK - I Don't Know
IDTT - I'll Drink To That!
IFU - I F'd Up
IGP - I Gotta Pee
IIDKB - If I Didn't Know Better
IIRC - If I Remember Correctly
IIWY - If I Were You
IK - I Know
IKWYM - I Know What You Mean
ILU - I Love you
ILY - I Love You
IM - Instant Message
IMAO - In My Arrogant Opinion
IMCO - In My Considered Opinion
IME - In My Experience
IMHO - In My Humble Opinion
IMNERHO - In My Not Even Remotely Humble Opinion
IMNSHO - In My Not So Humble Opinion
IMO - In My Opinion
INC - INCluding or INClusive
INPO - In No Particular Order
IOH - I'm Outta Here
IOW - In Other Words
IPN - I'm Posting Naked
IRC - Internet Relay Chat
IRL - In Real Life
IRMC - I Rest My Case
IRO - In Region Of
IS - I'm Sorry
ISC - I Stand Corrected
ISDN - It Still Does Nothing
ISP - Internet Service Provider
ISTM - It Seems To Me
ISTR - I Seem To Recall
ISWYM - I See What You Mean
ITRO - In The Region Of
ITRW - In The Real World
IWALU - I Will Always Love You
IWBNI - It Would Be Nice If
IYKWIM - If You Know What I Mean
IYO - In Your Opinion