by keiland b February 7, 2009

When a group of three of more people (regardless of gender) take turns preforming or receiving sexual acts from one person( of any gender)
Brett’s girlfriend gets angry when hangs out with his friends even though she lets lots of guys run a train on her daily
by Snailbob September 11, 2020

Can't be less than 4 males + 1 female in VOLUNTARY sexual intercourse NOT rape or any of that chump sh*t
by PhillyNigga12inches February 12, 2006

by NeverlackinZack October 2, 2016

by Elmo June 11, 2004

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?"
"Was Aaron just in the bathroom running a train?"
by Josh FTW December 29, 2007

by Turckypusymann October 3, 2016
