When you fuck a chick in the ass (preferebly a butterface or an ugly chick? and then cut off her head to hide the evidence...excellent if you dont want anyone to know you fucked an ugly
Fred- "ah man i saw this chick at the bar and she had a kick ass body but i later found she was a butterface so i pulled a cape cod gillotine and nobody knew"
Frank-"wow dude i never woulda known if you didnt tell me just now"
Slap your friend's adam's apple with your penis while he's sleeping, then throw your hands up and scream "You Just Got Meat Guillotined", throw water on him, and walk out.
The act of pinching off the tip of a loaf after it has been coming out of your asshole before you reached the bathroom. Most of the time resulting in a skid mark in your drawers.
Hey, can you pull over at the next stop? I'm guillotining a turtle headover here. (spoken from the passenger seat during a long drive)
When an uncircumcised man is receiving oral sex, and his partner becomes startled, causing them to bite down and cleave his foreskin, leaving behind a perfectly circumcised penis and a newly Orthodox Jew.
A horizontal guillotine running on a track supported by FOUR posts. Your head goes between the tracks. As the guillotine blade approches, a light notifies you to begin a swift kicking motion (Put all you have into it!) An arm is triggered as the blade passes which pushes your detached head forward, making contact with your extended leg. The best case scenario is you punt your own severed head into the grand canyon. (Very difficult to achieve as you only get one try.)