The act of a man fucking a person doggy-style, while having a double ended dildo up his ass, and simultaneously fucking another person behind him with the opposite end of the dildo.
I was a runaway freight train on the San Francisco Railroad. My hips and ass hurt from all of the "chugging."
by Herbie VerSmelt April 23, 2013
The act of tucking one's penis between his legs and into is own anus. Then passing his own erect penis out of his asshole.
by anonymoose16 August 05, 2009