This article is from the rec.arts.sf.movies FAQ, by Evelyn C. Leeper evelynleeper@geocities.com with numerous contributions by others.
BTW -- "By the way"
FYI -- "For your information"
IMAO -- "In my arrogant opinion"
IMHO -- "In my humble (honest) opinion"
ROTF -- "Rolling on the floor"
ROFL -- "Rolling on the floor, laughing"
RPG -- "Role playing games", like D&D (Dungeons and Dragons)
wrt -- "with respect to"
 
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