guillotine rub

when a person with dentures takes them out then performs fellatio

When a male goes to the bathroom to urinate and does not remove his belt, so he unzips his pants and sticks his penis through the opening through the front of the boxers and through his zipper opening.

When one wizzes into a toilet with the seat up and an imperfect seat mechanism causes the seat to fall and break the stream thereby sending piss everywhere.

A name given to large, razor-like blade that was used to execute people in a quick and "painless" fashion. The French became obsessed with it, especially during the late 18th century and early 19th century, when the French Revolution was at its peak. Two of the most famous people executed by use of this machine were King Louis XVI and his wife, the famous (or infamous) Marie Antoinette, the last queen of France. Many thousands more were murdered this way. The mechanism is released via rope and falls under its weight, severing the head from the body underneath it. The death is supposed to painless, but there was some evidence that the machine wasn't always effective and some even believe that a few heads survived for 10 or 15 seconds after decapitation. The last person who met with Madame Guillotine did so on September 10th, 1977.

an entire ass or just the sphincter itself

When you stick a sharp object onto the end of your penis, then make a bitch deepthroat you until it cuts her throat.

The act of shanking someone through the temple into the brain while he/she blows you, causing him/her to involuntarily bite down on the penis with maximum force, as they die. Often suggested as a test for the virility of the shank-er (as a sufficiently turgid member should withstand the maximum force exerted by a jawing).