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The parallel brown lines left on the porcelain of a toilet bowl after a flush.

These resemble the smoke lines left by the precision aerobatic team the Red Arrows of the British Royal Air Force.
"I don't know who was last in that toilet but it looks like the Brown Arrows sure put on a good display..."
by Cheviot Ranter April 17, 2009

Words related to Brown Arrows

mud marks shit stain skid marks skids toilet