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."
Pulling ones flaccid penis through the fly of their jeans, and walking around in a casual manner. This is usually done in bars or clubs, due to the low light. The purpose is yet to be determined, as most users of the Hanger 18 are drunk and have no real motive.
All the girls by the bar were disgusted to see that he was pulling a hanger 18.