Fourth Rail

1. A type of railway electrification where an extra rail is added in place of third rail, used for current return purposes. Few railway system uses this, notably being the London Underground

2. A group making railway games on the Roblox platform. Their notable game is British Railway

1. You have to look at the fourth rail near Embankment, it needs to be checked

2. Damn Fourth Rail is making a train game with realistic sounds and driving system?!

by tenpit March 21, 2023

Fourth Wheel

The fourth wheel's job is to make sure the third wheel doesn't step his boundaries as a third wheel.

Girl: Hey, I've noticed that John has trying to cheat with me lately. Should we invite Henry to fourth wheel for us?

Boy: Yeah, I think John stepped his boundaries. Ill call Henry now.

by Celestivic April 9, 2017

fourth of july

a night where family gets together drinks beer, plug up their big amplifiers and play jimi hendrix version of the national anthem...
and watch fireworks

fourth of july was today and the family got together and drank beer

by Jared1818181818 July 6, 2008

fourth eye

The section of the anus that cannot be seen without special night vision goggles that can see through the thick haze of feces. Excessive ass pounding can also open up the anus far enough to see the fourth eye.

Dawg 1: Dude I saw my Mom's fourth eye last night.

Dawg 2: Me too. I always beat off to your Mom through the bedroom window.

by GAPING BUTTHOLE MASTER August 1, 2012

Fourth of July

A day when all non-U.S born people in America go to the mall to annoy those that are being forced to work that day.

Hey Maaaang, we should to go the mall and chill on the Fourth of July!

by Miss Kittie July 5, 2008

fourth base

see home base

"he tried to get to 4th base with me.."

by etchasketch October 21, 2003

Fourth Wheel

Being left out by your three other friends having a threesome.

Phil: Dude why aren't you joining?

Carl: It's ok I'm just the fourth Wheel

Phil: Bruh

by COKE AND COLA February 22, 2022