Very cool of you to take a moment to help educate me, I appreciate it.  
I came up with yet  another definition, as well.
The other one I found talks about the girl "scissor locking" the guy, like in wrestling. She squeezes him with her legs. I'm envisioning something similar to MMA ground and pound type moves. The same article referred to the lady needing to be at a certain size, especially with larger stronger guys. It referred to the lady also needing to be somewhat athletic- both strong and flexible.
So, OP What exactly are you looking for? Although I don't fit the criteria if it's the one I just referred to above I'm still super curious.  Please share.