Midnight Monorail 

To poop in another's butt and then have that person poop it back into your butt, poopetually.

Cindy and I took a ride on the Midnight Monorail last night, and I ain't talkin' about at Disneyland.

Midnight Monorail by Twink13 March 29, 2009

Springfield Monorail 

A public works project that is a huge waste of taxpayer money that turns out to be either a scam, a huge waste of money or both.
Comes from the Simpsons episode "Marge vs the Monorail" where Springfield spent all their money on a monorail only to have it fall apart on its maiden voyage.

The sky lift system cleveland put in fell apart after a week. That thing was a real Springfield Monorail.

Springfield Monorail by Dark Lord Cthulhu September 8, 2013

big ass monorail

Origin: R. Crumb, 1960s-era underground comic artist. A bitch with an ass so big and bubbled that the top actually forms a shelf or seat, possibly large enough for an averaged-sized commuter to ride to work.

Steve: Yo, check out the booty!
Paul: She's the big ass monorail headin' downtown!

big ass monorail by Dick Knibbler December 28, 2007

monorail cat 

Monorail cat is a popular internet "lolcat" or image macro of a cat laying what is known as "monorail style". This is where the cat will lay with all four paws under his body and head laying on floor. It was so named for its resemblance to the mass transit system, the Monorail. The most comon and most popular monorail cat is a Domestic Longhaired cat laying "monorail style" atop a sliding shower door.

*Monorail cat is offline for maintainance
*a caption to a picture of a sleeping kitten laying "monorail style".
*Monorail cat has left the station
*a caption to a picture of a monorail cat driving away.
*Hurry please, monorail cat is coming!
*a caption to a picture of a cat tied up as if to be tied to train tracks.
*Monorail cat now carries more passengers.
*a caption to a picture of a fat cat laying "monorail style"

monorail cat by melissa*f March 31, 2008

monorail 

MONO = ONE
RAIL = RAIL

One-rail mass-transit, you can find one in Sydney.

"I'm the best monorail-driver ever!"
-Homer Simpson

monorail by w00dy January 20, 2005

twoway monorail 

when two people take massive poops the size of footballs
and put them in each others dung-hole. then repeat the process until the butt hole is sore.

alban: do you want to do the twoway monorail?

nimrada:ok

twoway monorail by dr.shizzle December 18, 2009

monorail transfer 

A Monorail Transfer is when two women or men connect a tube to each others assholes and one person 'transfers' shit to the other persons asshole.

Jim and I had a Monorail Transfer last night. His shit was so hot in my ass.

monorail transfer by MaxxMind November 22, 2014