Slap

·vt To strike with the open hand, or with something broad.

II. Slap ·noun A blow, ·esp. one given with the open hand, or with something broad.

III. Slap ·noun With a sudden and violent blow; hence, quickly; instantly; directly.

slap-jacks
Pancakes made of the whole size of the frying-pan or spider. A country girl formerly was not conside...

Dictionary of American Words And Phrases by John Russell Bartlett.
slap-bang shop
A petty cook's shop, where there is no credit given, but what is had must be paid DOWN WITH THE READ...

Dictionary of The Vulgar Tongue by Francis Grose