My girl is more of a "gusher" than a squirter, although she has on occasion sprayed me while I was giving her the two-handed pussy massage. Most often it's when she takes top and then grinds her hips around with me inside her until my cock starts contacting the right things in there, then watch out. It's more like a reservior of fluid that is released over a couple seconds, and I can feel it flowing down my balls, across my ass cheeks and onto the bed. Sometimes there's so much that I'm drenched from my belly button to my mid-thighs, and the bed looks like one of those Rhorschak (sp?) ink blot tests. It is definitely not pee. She drinks a lot of coffee, and anyone who does that too knows that the pee is dark and has a strong odor because of it. Her "gush fluid" is clear, and had a consistency similar to astorglide, except a bit less viscous, and has no odor to speak of. I've read that squirting or gushing is a result of a G-spot orgasm, and less from clitoral orgasms, and my experiences bear that out. She has occasionally gushed when I'm going down on her, but that is very infrequent.
For the guys reading this that have always wondered about it, yes, it is everything that you imagine it and more. Those gushers are the most intense, powerful orgasms she has and I love them as much as she does. It's like real-time proof that you are doing what you should be doing for her, and watching her writhe on top of me as she looses control of herself like that is priceless. Nothing else compares.