Definition of no-tell motel in English:
no-tell motel
(also no-tel motel)
noun ˈnɛʊˌtɛl məˈtɛlˈnəʊˌtɛl ˈməʊˌtɛl
US slang A motel which is used for illicit assignations between lovers; a disreputable, cheap, or run-down motel.
Origin
1960s; earliest use found in The New York Times. From no + tell + motel.