Nerdsville - All About Computers & the Web Abbreviations by Jim Winer
People are lazy. They also like to have a secret language, just like kids, to exclude others. The following abbreviations (all in capital letters) have become common.
AFAICT
As Far As I Can Tell
AFAIK
As Far As I Know
BFF
Best Friend Forever
BTW
By The Way
CUL8R
See You Later
<g>
Grin
IMO
IMHO
IMNSHO
In My Opinion
In My Humble Opinion
In My Not So Humble Opinion