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A British term for anal sex. The Bakerloo Line on London's underground system is shown as dirty brown on the map. To ride the Bakeloo Line means to enter the brown tube and take a journey.
Dude 1: "Hey, how's your new chick, Dawg?"
Dude 2: "Great! She'll even let me ride the Bakerloo Line!"
by Wizards Sleeve January 26, 2007