A beautiful device used to behead tens of thousands of revolutionary scum during the French Revolution and the reign of daddy Maxamilien Robespierre.
Wow, it's so great how our benevolent leader Robespierre is so selflessly cleansing France of the filthy counterrevolutionaries with his guillotine so we can live in the Republic of Virtue!
by tired and angry February 27, 2018
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v. to hide a boner putting your penis in the natural/straight-up position. The penis log is well hidden and unnoticed, but the head exceeds the part where your belt fits...if someone lifts your shirt, they'll see your head saying hi
i had to guillotine my penis so my teacher didn't notice my boner when he asked me to pass up to the blackoboard...
by Puhercules May 8, 2010
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The act of squatting over one's anus and lowering your scrotum into the open orifice. Your partner then proceeds to clench their anus closed once the testicles are inserted. Thus, simulating the function of the well known, French guillotine. The anus is the "blade" and the semen is the "blood" after said "artificial execution".
"I was feeling a little historical last night, so I made my girlfriend give me the guillotine"
by Butt Funk May 4, 2009
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An unpleasant scenario in which a guy zips his fly up too quickly after urinating, thereby catching the head of the penis with the zipper.

See also: penis fly trap
"OW MOTHERFUCK" - guillotine victim #3185
by scout01 September 16, 2013
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V. or N.

During the course of fellatio, the forceful but willing removal of one's phallic tip, usually running simultaneously with male climax. The action is initiated through an upward thrust to fellater's lower jaw, causing the abrupt closure of the mandible, severing the penile head from the base.
The guillotine is a once in a lifetime experience, i.e. "I'm saving my guillotine for my wedding night...."
by The gentleman_4.50 May 9, 2008
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When a girl lays on her stomach and you slap your dick on the back of her neck.
by Josh Steffes September 27, 2010
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When you French kiss your girl and uppercut her jaw
"Yo james I hit my girl with "The Guillotine"
"Oh shit yeah todd"
by Fozzagain June 7, 2019
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