From an article in Details magazine for April 2013, p. 64, a quote given here without context:
“The house doesn’t even have a complete back. We had to be careful about the budget and determined that we could add the top of the roof in post.”
Add … in post is baffling without the context. Things get a bit clearer when I tell you that the house in question is the ominous Victorian house next to the motel on the set of the new A&E tv series Bates Motel (a prequel to the movie Psycho), and the speaker is Mark Freeborn, the production designer for the series. But that gets you only part of the way; you also have to work out that post is a clipping of post-production in the jargon of filmmaking and video production. And of course you need to know what post-production refers to as a technical term in this world.