Top definition
To fuck the same girl your friend has previously just fucked.
I was banging a girl and i busted my load in her mouth, then my boy came and fucked her too. We ran the train on that skank.

Nick: Yo, running the train on Dayna last night was so sick.
Justin: Yeah, good thing i went first, i didn't want sloppy seconds.
by Justin Torok werd. October 04, 2008
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2
Dude I saw you eying Brenda, are you running the train on that?
by mj358(838384857 July 25, 2008
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