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A group of guys stand in a line outside a room. One by one, they enter the room to have sex with one girl inside. The line must have at least 7 guys to be qualified as a train.
"What's this line for?"
"We're running a train! Go to the back of the line."
by bigbadbob February 25, 2003
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To "run a train" in sexual terms means that a group of men wait to have sex with one girl. Usually it does not qualify as a train unless there are more than 7 men involved but the term train is used to describe any number that is more than 1 with a female. The female has sex with a man and after he cums another man enters the room to have sex with the female and so forth. It is only considered a train when the woman is fully aware of the situation and allows for the men to have sex with her. Otherwise it would be considered rape.

Differs and is often confused with gang bang. Train involves sex with one person at a time while gang bang is when a group of males having sex with a female at the same time.
"Shorty right there is a true freak. Me and my boys ran a train on that trick the other day."
by m-t-a July 01, 2006
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Doing two lines of cocaine simultaneously, one in each nostril. Also known as "riding the rails" or "skiing"
Man, I did a train a few minutes ago and now I'm jacked to the fucking gills!
by alpha1 March 12, 2014
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When a girl have sex with more than one guy. Normally guys would line up or wait for one another to get done. Participants would go in the room one by one to have sexual intercourse with one girl.
Guy: wassup witchu ?
Thot: nothing still want me to slide?
Guy: yeah but my manz here....u goin help em out?
Thot: what you mean?
Guy: you goin let us run a train?
Thot: I mean ....I guess
by Hood nigga๐Ÿ˜Ž August 12, 2016
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