Short for "F" ed up train. Worst train in the NYC Subway, slow as hell, always delayed, fun for kids.
God damn, the F train is delayed again, I'll never get to Coney Island on time.
by JJthedicktionare March 24, 2021
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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
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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."
by snacktivity October 31, 2014
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