Halley’s Comet (n): a euphemism for the violent projectile formed when a man cumshots a kidney stone. Not to be confused with commonplace occurrences like the ‘cum cork’ or ‘poop noodle’, the Halley’s Comet is a once in a lifetime experience characterized by:

(1) the catastrophic release of pressure necessary to cause a kidney stone to exit the urethra with a minimum muzzle velocity of 500 ft/s (152.4 m/s in CommieSpeak). The terminal ballistics of any given comet is determined by both the mass of the stone and the anger placed into the cumshot.

(2) the signature formation of a white trail of liquid aerosol cum behind the comet which lingers in the air for several minutes, causing it to be dubbed ‘procreative napalm’ by Single Mom’s Magazine.

There are no reported fatalities from direct Halley’s Comet impact (in the 1st world) however they do account for over 1 domestic ER visit a day in the US alone. Halley’s Comets are the leading cause of PTSD in men over 40.
Psychologist: “Tell me about your most recent Halley's Comet ”
Patient: “Just like the other ones, my dick looks like a waffle cone... My neighbors flipped out on me because they thought I intentionally shot their dog with a bb gun, then when I explained that I accidentally killed their dog with my exploded bee-hive looking dick, they just freaked out like I said something ridiculous.”
by Dice E Fleisch March 29, 2015
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"Dude i totally just Halley Nani -ed this futon! My bad!"
by gstimax March 20, 2008
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To have a 'Halley Cropper' is to have performed an act which is perhaps indecent, stupid or inapropriate. The term is derived from the popular coronation street character. For instance if u have had a Halley Cropper, you've had an absoloute shocker
Doug drops his drink on the floor after having too many.
His acquinatnce exclaims 'you have had an absoloute Halley Cropper their'
by David Kingo March 13, 2008
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A Halley's Comet is a particularly large, compact bowel movement that is so efficiently delivered to the toilet that it does not require any toilet paper whatsoever for clean up. The term "Halley's Comet" suggests the rare nature of this achievement... likely to genuinely occur only once or twice in a lifetime.
"Man, what a wicked dump. Felt like a Halley's Comet, but it turns out I still needed some toilet paper."

"I ran out of toilet paper last night. Fortunately, I had a Halley's Comet this morning, so I was good to go."

"That was the most satisfying shit I've ever had. Pure Halley's Comet. I hope I have another one in the next 80 years or so."
by Sachin is the God March 29, 2017
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After cuming and cleaning up with tissues, throw the tissues at your root to create the flying halley's comet.
"hey bitch, catch this" as i throw halley's comet at her back.
by Mr meanings April 25, 2011
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A sex act where the man sits on the toilet facing the tank with his partner (easiest achieved with a female partner) on his lap having sexual intercourse with full penetration and while the man humps his partner the partner is making a bowel movement (hopefully into the toilet as to reduce cleanup)
Tony and Ashley had to spend the whole evening cleaning the bathroom after their Halley's Comet .
by Shockwave9d2 July 3, 2015
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The most perfect soon to be couple! Logan is freakin perfect for Halley!
Ex. Halley and Logan are gonna go out soon!!
by NN April 5, 2005
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