A sex position in which a group of men are either penetrating each other in a line, or performing fellatio on each other in a circle.
All aboard the MAN_TRAIN! CHOO CHOO
The mantrain lasted for several hours and included vigorous pelvic-thrusting action.
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A group of males in a line, coupled to each other like train cars through anal penetration.
The men shouted, "CHOO CHOO All aboard the MANTRAIN" as they engaged in aggressive anal intercourse.
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