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a genital train is basically an orgy with either all men putting ther penises into each others anusses or one woman with a dildo in the midle and men behind her and infront all with their penises in each other. Otherwise know as a G.T
"wow there was only three of us but we still had a genital train you know a G.T, i had to use a dildo cus i ad 1 guy beheind me one in front sooo good"
by jodizilla n stacekong October 25, 2006
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