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1. pulling a train
1.When a woman has sex with a series of men, one after another.
2. When a woman performs oral sex with one man while receiving doggie-style sex from another man.
Polly Perkins was caught pulling a train with Rick Von Sloneker and his friends.
2. Pulling a train
A form of gay sex. When a gay man receives anal sex from multiple partners in succession. Sometimes performed anonymously, with the recipient blindfolded.
Steve was pulling a train last night and I can't believe that Larry wanted to be the caboose.