Often spoken on the phone, when simultaneously also on the train.
*ring ring. ring ring*
A: "Hello"
B: "Hi"
A: "So I was..."
B: "I can't hear you I'm on the train!"
A: "Sorry what's all that noise? I can't really hear you."
B: "What? I'm on the train, I can't hear you!"
A: "You're on the train?"
B: "No... I'M ON THE TRAIN!!!"
C: "Shut the fuck up!!!! Can't you just be a bit fucking considerate to your fellow passengers for fuck's sake??!!"
by ericmaj July 11, 2009
The vehicle that moves fast and choo choos.
by Set Blue 23 October 4, 2017
An activity usually involving multiple males and one female. The males usually take turns fucking the female and just then switch off after they get their nut in. An avetard gets extremely horny all the time and always thinking of this activity with any female he sees.
"AYE WHO TRYNA RUN A TRAIN ON JULIA?"
by TurnM3Up November 12, 2019
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
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 1, 2006
Something Bruno Mars would jump in front of.
I'd jump in front of a train for ya
by Gnar456654 March 31, 2011