noun, plural flop·hous·es [flop-hou-ziz] /ˈflɒpˌhaʊ zɪz/.
- a cheap, run-down hotel or rooming house.
- US and Canadian slang a cheap lodging house, esp one used by trampsAlso called (in Britain and certain other countries): dosshouse
In one of [Cincinnati’s] slum districts stands the Silver Moon, a “flop house” (i.e., a house where the occupants are “flopped” out of their hanging bunks by letting down the ropes) …. [“McClure’s” magazine, November 1904]
(But this explanation is not found in other early references.)