A house; perhaps from the Italian CASA. In the canting lingo it meant store or ware house, as well as a dwelling house. Tout that case; mark or observe that house. It is all bob, now let's dub the gig of the case; now the coast is clear, let us break open the door of the house.
CASE
Meaning of CASE in English
Slang English vocab. Английский сленговый словарь. 2012