When you fuck someone really hard.
You fuck someone so hard it's like a train getting derailed off the tracks.
You fuck someone so hard it's like a train getting derailed off the tracks.
by Turbulence n' Jeff December 08, 2007

by Uncle Pen June 10, 2018

1. During the act of doggy-style vaginal intercourse, the male, while recovering from a thrust, pulls out too far and his penis "accidentally" inserts itself into the girls anus.
2. An arctic map in the video game "Call Of Duty: Modern Warfare 2."
2. An arctic map in the video game "Call Of Duty: Modern Warfare 2."
1.
"The other night my girl moaned some other guys name, so I derailed her. See if she does that again..."
2.
"Last night I was having some fun, then got derailed"
"You pulled out too far and got mud on your junk?"
"Worse. I got that shitty snow map."
"The other night my girl moaned some other guys name, so I derailed her. See if she does that again..."
2.
"Last night I was having some fun, then got derailed"
"You pulled out too far and got mud on your junk?"
"Worse. I got that shitty snow map."
by FunkyPunkyJunky March 20, 2010

by Wendy (bob's girlfriend) January 22, 2009

A band from stockport/manchester
Arthur - lead guitar/lead vocals
Luca - rythm guitar/vocals
Will - drums
Sam - bass
IG @derailerofficial
Arthur - lead guitar/lead vocals
Luca - rythm guitar/vocals
Will - drums
Sam - bass
IG @derailerofficial
Derailer are a great band
by will galliway January 26, 2018

The act of making any discussions gone off-topic
The extreme form of derailing is trolling, and because of the trolls, any discussions gone into flame wars/insult wars
The extreme form of derailing is trolling, and because of the trolls, any discussions gone into flame wars/insult wars
by Sir. B June 30, 2021

To have sexual intercourse.
A: "I hung out with that cute blonde last night."
B: "Did you derail?"
A: "Hell yea. I derailed. So good."
B: "Did you derail?"
A: "Hell yea. I derailed. So good."
by DryLee November 05, 2006
