A term used to describe a place that is rumored to exist but conclusive evidence justifying its existence has not been found. Often it is used when people get lost while looking for a place they cannot find.
Etymology: The term comes from the supposed location of the alien bodies found at Roswell. It is thought to be somewhere in New Mexico and is highly protected by the government. The mantis
band, Megadeath wrote a song about "Hanger 18".
"On our way to the Pottery Barn, we looked everywhere for East Lyman Street but I think it was a Hanger 18. Instead, we took a different route."