Acronym for 'Out Of The Box'. Also meaning 'too far', weird-o, beyond sad.
'You're mom's a planet!'
Out of Town Behavior: Misbehaving conduct that only occurs when people travel outside their local geographic area and then perform in ways they wouldn't be dead caught doing in their hometown. Usually a girls or guys weekend trip to somewhere like Vegas, AKA girls gone wild.
The girls went to Vegas over the weekend and displayed some serious OOTB.
Acronym for Order of the Bro, a secret monarchic society governed by the Bromomancers and their Broboxian Disciples.
I wish i was cool enough to get into the OOTB.
Out Of The Blue
i.e. apros of nothing whatsoever, non sequiter, randomly. Can be used simularly to btw
"So I was talking to Joe about the garden, and ootb he asked me to marry him! Can you beleive that guy?"