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The Subway surprise, as it were, is a phenomena associated mainly with homosexual men. It is the act of inserting a clear plastic tube into one's anus. Then, a partner slides the other end into his ass. then, partner one defecates into partner two ass, the turd representing a subway car slipping and sliding into the next chocolate train stop. Sometimes, the duo rocks back and forth, sliding said turd between each other.
"You aren't implying anything icky by saying you'll give me The Subway Surprise....right Jared?"
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