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A very physically attractive person, almost exclusively used by stuck-up white men when referring to a young woman or women. Particularly used when the woman in question is well dressed.
Hey brother, check out that female, she's certainly on rails.
on rails by J Deed January 14, 2011

ruby on rails 

Ruby On Rails is the next generation web application development framework, it allows developers to write beautiful code by favoring convention over configuration.
Ruby On Rails, also referred to as Rails or RoR is used by some of the leading Web 2.0 applications on the internet today and was ranked as the number one technology you need to know about in 2007.
Boss: Do you know anything about Ruby On Rails?
PHP Developer: I've heard its more hype than anything else, nothing that can't be done with PHP.
Boss: Your fired. *Should have hired someone who can think outside the box*
ruby on rails by Ivan V January 1, 2009

ruby on rails 

A web development technology that has more hype than popularity. It's a popular first choice of develoepr that don't intend to actually be around when the product is finished or put in to production. It allows for really flashy demos that impress bosses while being backed with nothing.
This job is about to go away so I think I'm going to use Ruby on Rails for the last month or two before I leave.
ruby on rails by Rails Programmer September 19, 2006

Tits On Rails 

When your mini quadcoper is flying well (or locked in), and the pilot is having a very good flight performing every trick spot on. This however is not the same thing as “ripping balls”. Ripping balls tends to be a much angrier and separating flight.
Yo man, that flight was tits on rails!
Tits On Rails by Beaupre FPV March 24, 2019

Rails on rails

Doing blow on a train.
“Took the train to New York , did some rails on rails
Rails on rails by George jung1 December 31, 2025

Dancing On The Rails

Doing something extremely stupid or reckless usually for the amusement of others or for the thrill of doing something daring. Often occurs as a result of peer pressure.

The expression originates from the urban myth(?) of someone dancing on the railroad tracks and paying for the foolish mistake with their life.
Dana: Look at Jimmy. He’s dancing on the rails again

Bill: What an idiot! He’ll get hurt if he doesn’t stop it!