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A large type of cannon that uses 2 or more rails (hence the name) that are charged with electromagnetic energy. They electromagnets propel a projectile at high speeds over great distances. These weapons do get very hot after use and therefore require great cooling power.
The US Navy is currrently working on a project to equip a new type of Destroyer with rail guns.
rail gun by p8ntball4life79 July 7, 2006
Means 2 things:

1) A weapon under development. Used against a giant robot clawing the Pyramids of Giza.
2) Ability that can fire straight electric shots, with anything iron-made as head.
3) A tomboyish woman who loves wearing boylegs, loves a frog mascot, has more than 20,000+ clones and fell in love to an unlucky bastard named Touma.
1) Rail Gun is a futuristic weapon.
2)Agent: I want a prototype weapon called a Rail Gun.
Ship Captain: That's classified.
Agent: Don't talk to me about CLASSIFIED!
3) A Rail Gun shot was deflected once again by the UNLUCKIEST BASTARD on Earth.
Rail Gun by Kay Tutan Tayo December 6, 2018
When a butt plug is shot out of an anus due to ingesting cheap Mexican food and cocaine.
I took my girl to Taco Bell after the club last night. She must have been skiing in the bathroom, because when we got home she went off like a rail gun and put her but plug through my neighbor’s window.
Rail gun by Comp B September 10, 2020
a badass type of rifle which fires an extremely fast projectile. Used by Arnold Schwarzenegger in the movie Eraser.
rail gun by smartkid June 23, 2005

Anal rail gun 

The act of suppositing a large, mortar shaped metal butt plug into the anus, then nipping down to your local hospital for your MRI scan.
The magnetic resonance has been known to instantly accelerate the supposited metal object up to the speed of sound and deposit it elsewhere in the torso.
"Hey Arthur, did your wifes hospital appointment get in the way of your sexy weekend away?"
"On the contrary Jim, we were banging like the shit house door when the plagues in town. Hospital appointment looming and with her voyeuristic ambition, things got really sexy and I coaxed her into an anal rail gun.
Anal rail gun by ChewMyR00t May 11, 2023

anal rail gun 

To wear,insert,or make use of a metallic Buttplug, while in an MRE machine.

Step 1. Wear a buttplug with a metallic core, or just wear a fully metal buttplug in your rectum

Step 2. Schedule an MRI or have a Walk-in MRI at your local hospital. While still wearing the Buttplug

Step 3. Lay on the MRI table and let nature takes it course.

As soon as the MRI machine is turned on, the buttplug will shoot at the speed of sound itself into your anal cavity, through it, and into your chest cavity.

Chance of survival is Low, but not impossible.
"Man, That Anal Rail Gun was intense! I gotta remember to take out my plug next time!"
anal rail gun by The Dab Pad December 7, 2024