. A petty cook's shop, where there is no credit given, but what is had must be paid DOWN WITH THE READY SLAP-BANG, i.e. immediately. This is a common appellation for a night cellar frequented by thieves, and sometimes for a stage coach or caravan.
SLAP-BANG SHOP
Meaning of SLAP-BANG SHOP in English
Slang English vocab. Английский сленговый словарь. 2012