to rob, to swindle; thus flap the dimmock v., to pay (money).
|Sl. and Its Analogues.|
(UK Und.) to trick a simpleton, to swindle an innocent victim.
|Daily Tel. 18 Aug. 3/1: He and three others of the division had cut up 70 between them, obtained by flapping a jay, which, rendered into intelligible English, means plundering a simple-minded person [F&H].|
|(con. 1930s) Texas Stories (1995) 139: We moved the minches and flapped the jays every night.‘The Last Carousel’|