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
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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
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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
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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
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to drive a train, as a train driver wood

not what all of u r thinking, PERVSSS
tim: do you wanna go run train
timothy: u mean like drive a train
tim: yeah what else would i be talking bout
by timmydee32 June 11, 2007
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To beat the shit out of somebody or "go crazy on their ass".
"I'm about to run train on that cunt!"
by pistol08 October 8, 2008
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when one male fucks a female in the anus, and then another male inserts his scrotum into said female as the first males ejaculatory juices seep from the females anus and proceeds to fuck said females anusuntil he himself blows his wad in that hos ass, so to speak.
me and my bro elliot prformed the act of running train on that fine ass cookie kendall last night she blew her whistle real good
by Kendall Stalker 69 69 April 13, 2008
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