Dear mytake,
I didn't go to medical school either, but that shouldn't be a deterrent for anyone as to understanding female orgasm 
No, women can't fake squirting. They either squirt, or they don't. But please, don't take squirting as the end-all be-all of female orgasm. The experience is as individual as there are women. In fact, not every orgasm is the same for every woman. Sometimes, we squirt, sometimes we don't. Sometimes we shriek and sometimes we're very quiet. Sometimes we move our hips, and sometimes we lie still. It all depends on who's doing what to whom. As for cunnilingus, if the lady is pushing you away, it's either because she's had her orgasm and she's done, or, she could just be overstimulated. Or, maybe HER favorite activity ISN'T DATY. If that's the case, then consider yourself lucky that you got to lap around for a while, and move on to something else.
My question is this: why is it so important to have an EXACT definition of what and when female orgasm occurs? I don't think women are so aware of it themselves, quite frankly. I don't think we sit around and ask ourselves about our quality and frequency of orgasm. We like'm when they happen, but most of us don't overanalyze. That's an orgasm-killer, for sure. But I assume that for men, the view of sex is much less mysterious than it is for us. Men have had a perfect view of their genitals since the day they were born. Their evidentiary process for ascertaining orgasm is simple: just watch the spoo come flying, and that's it - bingo, orgasm. For us, unless our G-spot is stimulated, we don't squirt, and we can't see what's going on down there when it's happening. So basically, all we've got to go on is our own brain activity. In that department, we surely are more cerebral, LOL. I'm sure you get my drift.
As for faking it: welcome to the world of sex, both paid and free. It's impossible to expect that every woman you lick will be orgasmic. It just doesn't work that way. Depending on a woman's cycle, mood, chemistry with you, etc., etc., she may or may not orgasm. If you keep obsessing about signs, faking, etc., then you'll divert valuable attention to enjoying the moment. Yes, it's possible that some women fake it, particularly if they're paid. But then they let you off scot-free, and don't berate you about what a shitty lover you are, which they can do quite freely if the sex is free.
So, it's your choice. I say relax and take what you can get and quit worrying and thinking about it. And, if you really, really want to know about women's orgasms, read the Hite report, where you'll find over 3,000 females describing exactly how they feel and why when their boat's rocking.
Happy munching,
the Love Goddess