running a train simply means one person is "doing" a girl in her anal while the other is "doing her" in her vagina at the same time
not really that's double penitration or double stuffing
running train is lining up and having sex taking turns with 2 or more guys and 1 or more girls
Phrase is most commonly used when referring to gang raping a female. It is also called "pulling a train" when one female takes on several gujys.
Previous answer (above) is wrong! running a train simply means there is a bunch of guys 5 or more that are taking turns to have sex with one girl!
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