one man train Share definition Flag When your boyfriend aka "The Fox" has sex with you for over an hour. It's like a train was happening but with only one person. My boyfriend ran a one man train on me last night, and I am exhausted. one man train by Pinksyringes June 23, 2014 0 0 Get merch Get the one man train mug. Buy Now — $32.95 See more merch