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A sexual act involving a minimum of 3 males. All the males involved perform anal sex on each other in the doggy-style position while giving the male in front of them a reach-around simultaneously. The arm motion created by giving a reach-around represents the arm of the train that links the wheels. Finally, the male at the end of the train must use his unoccupied hand to penetrate his own anus with a dildo, so as not to feel left out.
Male 1: Yo, my ass and right arm are so sore from last night's pump train.

Male 2: At least you weren't at the back of the train like I was... both of my arms hurt, since I had to fuck myself with my other hand.
by Drerunsit August 03, 2010
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