Of a girl or of a woman, to flashby spreading one's thighs, while seated wearing a skirt or a dress, in such a way as to reveal one's crotch or camel toe, whether on purpose or by accident.
If you really want to get a guy's attention, shoot beaver.
That chick behind us is shooting beaver. Take a look.
The act of gaining an upskirt view of a female through covert action for the purpose of discerning whether the target is wearing undergarments. (If the answer is no, you done shot yourself a beaver skippy).
"Dude, I was at the mall today. I rode up the escalator for an hour and shot like 3 beavers."