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A term used to describe washing your genitals on a train using a bottle of coke and mentos after receiving fellatio from an unsavoury character such as a cheap hooker or toothless vagrant (the two are not mutually exclusive). To use a train bidet one stands oneself above a bottle of coke so that the spout it pointing towards the groin. After removing ones pants, one then drops a mentos into the bottle allowing the foamy goodness to cleanse ones genitals.
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