Orthogonal Perpendicularity
Is intelligence directly related towards skill in chess?
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Obese people
Orderly Procession
I guess the last 10 pages of this thread answer the original posters question.
Offal pancakes.
Octopus Pepperoni
Oyster Pizza
Over Posting, Obscuring Perspective, Original Possit
Opposum Pie
Obfuscated Purpose
Obdurate Prostrate
Overly Pragmatic
Oxen Projectile?
Oversized Poison?
Orating Pooch?
Why limit yourselves to OP? Try out "PO" as well. 
"She" appears to have lost interest in this lovely thread. Good riddance.
Job well done!
.....................oblong poop