When you're hitting a girl from behind (be it doggie style or anus) and just before climax you remove your meat from selected orifice (preferably anus) and drop your load (aka skeet) on her back. Then piss (aka shoot) selected load droplets off her back. For style and safety we recommend a shooting jacket, goggles, hearing protection, and well-trained beagle.
"I went skeet shooting with Rebecca last night."
"Oh yeah, how'd you do?"
"I would have hit them all but I ran out of piss."