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1.When 3 or more males takes turn having sex with one female and having her perform sexual favors for them
1. Yo.... Jason, Sam I got this lil chicken head whose going to let us run a train on her
by Portia January 02, 2005
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when you and a couple of friends have sex with the same girl at the same time
" damn dat bitch thick"

"yeah we running a train on dat bitch"
by keiland b February 07, 2009
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When two or more individuals partake in sexual intercourse with a female. This reference is usually always used to mean such an act, but also can refer to taking a non-stop shit within a toilet, or any other activity that involves a certain degree of persistent that it becomes evident that it takes as long as a train to get the job accomplished.
I was running a train last night on my girlfriend.

"Was Aaron just in the bathroom running a train?"
by Josh FTW December 01, 2007
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