This might be a better thread for MPSIMS just because of the title, eh?
As a newbie (a rookie, a green, SDMB infant, whatever) I have seen quite a few new ones.
Post 'em here, please!
Some I’ve translated:
IMHO - in my humble opinion
IMNSHO - in my not so humble opinion
TMI - too much information!
VVC - very vaguely creepy (I loved reading THAT thread!)
FTR - for the record
What is:
IIRC - ?
There are others… they lurk in innocent sentences, threads and sometimes under the toilet seat.
None of the original examples you cited really qualify as acronyms; an acronym can be spoken like a word, e.g., NASA, HUD, NOAA. A few actually become words and are spelled in lowercase letters, e.g., laser, lidar, radar. General rule: If you can’t pronounce it, it’s an abbreviation.