Acronyms You've Never Heard Of

These are acronyms you would use using an instant messenger, but I bet you've never heard of half of these.

ADN: any day now
CID: crying in disgrace
CYO: see you online
FUD: fear, uncertainty, and doubt
G: grin
GMBO: giggling my butt off
GYPO: get your pants off
GTFO: get the f*** out
HDOP: help delete online predators
IANAL: I am not a lawyer (but)
IMNECTHO: in my not-even-close-to-humble opinion
IPN: I’m posting naked
LMIRL: let's meet in real life
MOOS: member(s) of the opposite sex
OMGBBQWTF: oh my God, Bar-b-q, What The F*** (surprise and confusion)
PlzKThxNo-Re: Please, ok, Thanks, No-Read (sarcasm)
ROTFLOL: rolling on the floor laughing out loud
WYSIWYG: what you see is what you get

For a full dictionary of acronyms here.