An anus that looks big enough to navigate a train through. An anus that resembles a tunnel going into a mountain.
I was going to fuck the bitch but as I tried I accidentally fell in her trainus and had to be extracted by the jaws of life.
by Phil M June 16, 2004
Get the trainusmug. by Jiggles6 February 21, 2011
Get the Trainusmug. by Thecreatoroftrainus June 11, 2020
Get the Trainusmug.