Three little letters seem to cause such a fuss. Here is a list that I will add to as my brain spits out new words and phrases to fit the acronym. When I get enough for a table or two, I will post a new article. (Be afraid, be very afraid.)
I invite others to submit their O.S.R. words, please submit them in the comments, in three word groups in order as seen in my examples below. NOTE: It doesn’t have to relate to RPGs, or at least not in an obvious way.
Obstinate Stinky Referees
Old Senile Roleplayers
One Shot Roleplaying
One Save Rule/Roll
Only Singing Roleplaying
Odiferous Slimy Raconteurs
Ornery Statistics Regulators (My personal favorite so far.)
Original System Resolutely
Obtuse System Rules
Obtuse Seething Revolutionary
Obverse Signage Regulations
Onomatopoeia Serving Rhetoric
Oranges Simmering Resolutely
Obtuse Seething Ridiculousness (A recent Kickstarter comes to mind, in addition to many other efforts to define three letters.)
Overpaid Senior Regulators
Ostracons Scoured Regularly
Ostrogoths Serving Romans
Ovulating Soothsayers Ruminating
Oscillating Sonorous Regurgitation
Ossified Spider Riders
Order Shiny Rings
Orthodontists Skewering Rodents
Overt Slimy Renters
Oysters Salaciously Rotated
Ossuaries Shattered Regretfully