When your railing her from behind and you pull out and bust a nut so hard it shoots her in the back of the head and she never saw it coming.
I was absolutely railing on Theresa last night. She got that vice grip pussy. I rearranged her for about 45 minutes and couldn’t hold it. I pulled out and gave her the old Wilkes Booth. Damn bear blew the back of her head off. She had to shower and wash that matted crusty shit out.
After you abe lincoln a girl, as soon as you slap the top hat on, a friend (who has been slowly working one out) jumps out of the closet and shoots a load to the back of the girl's head, then get the hell out of there. In a perfect world the culprit needs to break his leg and scream latin gibberish, but just jumping out a window/running out the door will suffice. Timing needs to be perfect so it all depends on the dude jerking it in the background being able to nut on cue.
When you sit behind an unsuspecting victim in a theater and jerk off, and at just the right moment, shoot her in the back of the head with your load and run out.
The sexual act of ramming someone from behind then pulling out and ejaculatingon the back of their head. Afterward, jumping out their window, taking off running, and yelling "The South shall rise again!!"