1.) The act of putting someone between the ground and the railroad train-tracks and then having sex with them, otherwise known as "railing someone."
2.) The act of a male rubbing his dick between a woman's boobs in a motion similar to a train.
3.) The act of someone moving over someone in a motion similar to a train whilst having on orgasm.
George Washington: I can't wait to receive my bi-hourly trainjob from Steven Universe Steven Universe: I'm here George!
George: AHHHHH PWETTY PWEASE RAIL ME STEVEN!!!
Steven: *Proceeds to give trainjob*
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).