rat line n. a covert path or itinerary used for smuggling, escape, or supply. Etymological Note: This term derives from the tendency of rats to create routes that are out of sight as much as possible, following perimeters and the bases of obstructions. (source: Double-Tongued Dictionary)
Further reading
A California listener shares a couple of pranks from her time in the U.S. Marines, where unsuspecting recruits would be ordered to complete impossible tasks. She remembers that newbies would be sent to retrieve a bucket of frequency grease or a...
Dylan from Charlottesville, Virginia, was rock climbing at his brother’s bachelor party when he heard other climbers called gumbies. Dylan figured that a gumby must be the kind of beginner or overconfident participant whose skills don’t...