the shark
Originating somewhere in Hilliard, Ohio in the early 21st century, the shark is a sexual manuever in which you place your hands together with fingers extended (like those silly karate men do when they bow).  You then insert your eight fingers into the anus of a willing, tied-up or otherwise incapacitated female, followed by the insertion of your thumbs into the vagina.  The entire hand is then moved side-to-side like a shark swimming in the ocean.  The effects of the shark are unknown, as it has never been attempted in recorded history.

Also known as:  Two in the pink, eight in the stink.
Tommy: "Dude, Harry, your sister was passed out on the sofa upstairs, so I gave her the shark!"

Harry: "NUH UH! Side-to-side and everything?"

Tommy: "You know it man!"

Harry: "Awesome, I'll bet she has to wear diapers for the rest of her life."

Tommy: "Yeah, after I got her I made you a sandwich."

Harry: "Alright!  Crunchy peanut butter!  My favorite!"

Tommy: "Yeah, crunchy peanut butter...."