Huh? Watchutawkinibowt?
If you google it you will find it's some sort of finance/investment company. I've never seen the phrase "prime focus" used on these forums before.
Edit: After searching for "prime focus" I see there are quite a few messages saying "taken at prime focus". It seems it's the phrase to use when you cannot specify the exact conditions under which a shot was taken..
PS. Yes, I'm ignorant and loving it...