When a bitch has had multiple dicks run through her over a short space of time.
In the ass, or the vagina
Niggas been running trains through that bitch. CHOO CHOO
by dugg stu flips June 18, 2013
Get the Running trains mug.
Running Train:
1. A train that is in working order, or is at the present time running.
2. Slang for working hard without any rest periods.
3. Slang for a group of people, usually men, possibly part of a club or group that have all had sexual intercourse with one woman/man, either during an orgy, or sequentially coupling with her/him over a short period of time. No compensation, except temporary popularity of the person who has been run train on, is ever given, and they are usually not held in high regard by their sexual partners post coitus.

Example:
1: "It's an older model, but it is still a running train that we use regularly."
2: "I've been running train on this project to get all the loose ends tied back up."
3: Steven : "I'm going out with Nicki (or random name here), she seems really outgoing."
Todd: Laughs, "Yeah she is 'outgoing'. She was a bat girl when we were in high school so she could go on away trips with the baseball team. They were running train on that chicken head for two years before she caught on what they really thought of her. If you hit that I'd wear a rubber, or maybe five."
by superdooper_365 September 12, 2013
Get the Running Train mug.
A threat that has sexual implications. Where a group of men gang up on one guy and fuck his ass as a train/tag team. Often resulting in severe bleeding and bruising.
Ima get the bois and ima run a train on your ass.
by Fact man March 6, 2018
Get the ima run a train on your ass mug.
When a man with a large cock rubs his dick (the train) all over a woman.
He wanted to run a train on me, but i said no, fuck you pervert.
by Lucario6669 September 27, 2016
Get the Run a train on me mug.
To do work on multiple people in a game or anything that has competition. IT IS NOT ANYTHING SEXUAL.
Jared: Wanna run train in gears later?
Dave: Yessir!
Jared: Don't invite Sam or else we won't be able to.
by Grogdog June 1, 2011
Get the run train mug.
To "do work" on players in Call of Duty: Modern Warfare 2 by shooting them in the face while dual wielding ranger shotguns.
Holy shit! That kid is letting the beat build, he is about to run train on that kid!
by LetTheBeatBuildBeetch November 16, 2009
Get the Run Train mug.