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Webster 1913 Edition

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Adj.

Very large; monstrous; big.

[Slang.]

, SLAPPING,

Adj.

Very large. [Vulgar.]

slapping

slapping ‎(plural slappings)

slapping ‎(comparative more slapping, superlative most slapping)

(slang) Very large; whopping.
- 1921, Dogdom: Monthly: Volume 22
  It remains to be seen whether she will retain her coat after whelping; if she does, then Americans will be able to admire a slapping great collie bitch — a matron of the robust kind yet retaining all those graces of the collie female of quality.