A euphemism for sex. Where the train is the penis, and the tunnel is the vagina.
Gary and Lisa have went upstairs to play trains and tunnels
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Used to describe a woman's vagina, when dicks, dildos, a large grapefruit, etc. enter it at regular intervals throughout the day.
Yo girl got a train tunnel vag.
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To take my cock and shuv it down some hot girls pussy!!! TUNNEL OF FLESH!!! OOOO YEA!!
I took the bishop on the train and through the tunnel of flesh
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