playdar
n.— «You develop what is called “playdar”—a bit like gaydar. Swingers can spot each other in public. A couple once picked me up in a regular bar.» —“Diary of a Swinger” by Ewan Morrison Daily Record (Glasgow, Scotland) Apr. 3, 2007. (source: Double-Tongued Dictionary)
Further reading
Mike in Glasgow, Kentucky, wonders about a catchphrase used in British comedies: I go to the foot of the stairs. The Oxford Dictionary of Catchphrases (Amazon) compiled by Anna Farkas and several books by catchphrase collector Nigel Rees both point...
A trucker in Glasgow, Kentucky, wonders about the term boom dog, a device used to secure things on a trailer. The boom may be inspired by a ship’s boom. The word dog has long been used in a variety of ways to refer to something that holds...