It's a colloquialism. What I mean is, I've spent the last three years studying the fossils of the Mojave Desert, focused on Tertiary mammal megafauna but I get a smattering of everything. Once got the chance to do some research on dinosaurs in Arizona, for example, and I spent two weeks once working 12 hours in the field, then coming back and working another 5 or 6 researching fossiliferous sediment in Washington State (that was a rough week, and my boss has told me that I'm not allowed to do that anymore). I do a LOT of field work; before my kid was born it was something like 40 to 50%. Basically, I have to be ready to head out for a week anywhere I'm told to go, within 24 hours. 85%+ of my field time is spent in the Mojave, however.
I have to say, I find it rather creepy that you're spending so much mental bandwidth on my biography. My career is nothing special; in my field, it's actually on the calm side. I've got a friend who lives in Texas, married a girl from France, and spent the last year on the North Sea in a research vessle. I've got another friend who grew up in Ohio, has his permanent residence in New York, and hops from country to country in Europe. I believe it was Charles Lyelle that said that a good geologist must explore the world as much as possible, and see every depositional environment they can; regardless of who said it, it's sound advice every geologist and paleontologist follows.
Again, none of this has anything to do with this thread.