O/T - O/T what else could it mean?

[watters]

in the porn world or otherwise?

on top ?

old trollop ?

[Hornetbloke]

Could be a term referring to the required location of the money shot: "on tits"

[Caractacus]

Or that perpetual inquiry: Obscene Theresa?

[jj]

Optimus Thrake, the infamous 50s director of such 'naughty' loops as 'Jitterbuggin' Jezebels' and 'Please, Mr Macmillan, Don't Put Your Hand There'.

[magoo]

`orrible tits/testicles

obscene titillation

orifice tickler

old tosser (insert your favourite pon directers name here)