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
by Dubsteppin June 17, 2009
Get the Trains and Tunnels mug.
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.
by David Niagra December 19, 2013
Get the train tunnel vag mug.