Short for "F" ed up train. Worst train in the NYC Subway, slow as hell, always delayed, fun for kids.
by JJthedicktionare March 24, 2021
The process of using a sex position, in which the guy pretends to be a train and rams the girl, with all his power, over and over again.
by B-Heat March 12, 2010
by C Stan May 28, 2005
When two people are getting it on on a regular basis but without any future commitments to one another.
"Heyo, those two are leaving together for the second night in a row... are they like a couple now?"
"Nah, from what I hear they're just boarding the F train."
"Nah, from what I hear they're just boarding the F train."
by snacktivity October 31, 2014