Post away! That's what these boards are here for.
People can use the word/term “getting wet” pretty broadly to describe being aroused, or more specifically to mean when during arousal, the vagina produces more slippery lubricating fluids.
I am assuming you’re talking about the second thing- the “wetness” itself. If I’m wrong, let me know.
I think a read-through of this advice column would be helpful. Heather answers a bunch of people’s concerns about not being “wet enough” during partnered sex. It is targeted toward people who don’t want to use lube, but I think it’ll be useful for understanding the whys and whats of “wetness”:
The I-Don't-Want-to-Use-Lube Blues.
The bottom line is that like all parts of our bodies and libidos, "wetness" is variable. We can become aroused at times we aren't actually interested in being aroused. And, on the other hand, we can find ourselves having lackluster physical sensations of arousal when we are interested. It can be annoying or even strange to experience, but it isn't something to worry about.
So! Lube! When you’re aroused and want to do something, but are finding that you aren’t comfortable with the amount of lubrication your body has provided, using lubricant can really help. If you aren’t familiar, or you want to learn a lot more about it, you might read this:
Lube 101: A Slick Little Primer . We’re here, of course, for questions.