1 definition by the train wrecker

a sexual act in which a man or woman get on their back while a line of men ejaculate on them, but this important: they have to go over the man or woman like their a train going over them and the gravy is obviously the semen.
Tim: "He Gerard you wanna do a gravy train on my girlfriend?"

Gerard: "Hell yea"
by the train wrecker February 12, 2009

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