berserker
When a Man is Fingering a woman with his index finger and she is laying on her back, then while she isn't expecting it, he puts his ring and pinky finger in her butt.

This one ups the Shocker

Man 1: Dude, I had Lisa on her back and she was getting really into me fingering her, so I gave her the ol' Berserker

Man 2: Fucking sweet dude.