The act which normally partakes in the process of having sexual intercourse with a woman on top where she leaves a trail of feces on her partner's stomach.
When someone with a penis or strap-on, fucks someone in the ass and then uses their utensil to lay down poopy tracks on the face of the anal-receiver making the mouth into the cross tie just like those damned chinese in the 1800s thus making a RUSTY RAILROAD.
Man: Bitch turn around so i can give you a rusty railroad.
Woman(or gayer man): NO! I don't want poop-dick tracks smeared on my face!
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).