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A: "I hung out with that cute blonde last night."
B: "Did you derail?"
A: "Hell yea. I derailed. So good."
derail by DryLee November 5, 2006
Derail; a verb. Used to indicate the exact point of derailment, AKA EPDI (Exact Point of Derailment Indication) A topic is derailed when someone clearly goes off-topic with posts which are obviously not associated with the original topic subject, or goes about anally raping the topic tavles by posting huge-ass pictures.
Let's derail that fucking topic!

That topic is bound to derail.
derail by MeMB January 4, 2005
This is when you mistakenly fallout of the vagina and literally smash the sphincter or asshole of a woman during sex.
I was having some intense sex with this chick, but I derailed and ruined everything. Especially her asshole.
derail by namgorf January 21, 2009
the act of sexual intercourse, usually referring to sex that is so hard it could knock a train off of the rail
Man, I derailed that chick so hard last night.
Would you care to join me for some derailing later tonight?
derail by Meeja July 19, 2017
DERAIL; a term used by the shmoo clan in order to replace shit, do it, and pwn.
1) Dude i have been holding this in but i really gotta deRail!!
2) Are you ready? Lets deRail!!
3) Dude you just got DERAILED!
DERAIL by Nathan C. September 18, 2005
Attacking or failing to follow the tactics of a debater who railroads the conversation, by expressing unexpected views or challenging logical fallacies.
She's upset because I took a third option that will derail her planned one-sided conversation.
derail by Poor Lurker August 2, 2012