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O

OAO - Over And Out
OBTW - Oh, By The Way
OEM - Original Equipment Manufacturer
OIAM - One In A Million
OIC - Oh, I see
OL - Old Lady
OM - Old Man
OMG - Oh My God
OOTB - Out Of The Box or Out Of The Blue
OOTC - Obligatory On Topic Comment
OPM - Other People's Money
OT - Off Topic
OTF - On The Floor
OTOH - On The Other Hand
OTP - On The Phone
OTT - Over The Top
OTT - Off The Topic
OTTH - On The Third Hand
OTTOMH - Off The Top Of My Head
OYA - On Your Ass