OCS is commonly recognised in the UK as the "One Complete Solution" company and their vans are often seen of the roads of our major citys. According to some muppet in the USA, OCS also stands for "Original Chicken Sandwich" and uses the example of "I really fancy an OCS"
As any self respecting porno-mag reader will know, OCS stands for "Open Cunt Shot" - a standard pose of your hardcore porno models where they lie back and pull their pussy apart for the camera.
I suggest our American friend doesn't use his example whist on holiday in the UK as he could end up with a well thumbed copy of Whitehouse being slipped into his sweaty palms!!
Jeesus, check that OCS out
Whilst in the bedroom with your good lady; "Come on luv, stop mucking about and give me an OCS"
(snigger) "There's the OCS Van!!)