Derailed 

When you fuck someone really hard.
You fuck someone so hard it's like a train getting derailed off the tracks.

"Greg derailed that bitch"
"I thought he had mono!"

"I'd derail her."

Derailed by Turbulence n' Jeff December 8, 2007

derailed 

one who gets plowed like a piece of land; one who gets laid the fuck out, one who gets bombed by sharif

Holy shit dunne just got derailed and broke his wrist.

WOW, Pauly Tess just got derailed.

HOTDIGGITYDOG, Stup just got lined up and defuckinrailed.

Wilferd Brimley here, If you or someone you know has dyabeetus and got derailed call Liberty Medical now.

Maxx=derailed.

derailed by Wilferd April 22, 2010

Derailed 

When one person has strong feelings for another but breaks it off( through the phone) 😤

“Ya I’ve been DERAILED” said young Phillip

Derailed by Uncle Pen June 10, 2018

Derailed 

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."

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."

Derailed by FunkyPunkyJunky March 20, 2010

Derailed 

A women losing her virginity in a very rough, hard manor.

Guy 1:Dude, I totally just derailed this one chick!
Guy 2: Me too!

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

derailed 

to fuck the shit out of somebody, then never talk to them again despite seeing them around a lot. Usualy occurs between upper and lower classmen in high school and college.

bro 1: jon derailed that chick at that party
bro 2: I know, shed in two of his classes to
Bro 1: awesome

derailed by jon Appleseed August 25, 2008

detailed programmatic specificity 

something the Australian Prime Minister, Kevin Rudd, says in speeches. Problem is no-one knows what it means.

"No idea what detailed programmatic specificity means." - Mr Turnbull

detailed programmatic specificity by Angelspike July 16, 2009