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Webster 1913 Edition

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Adj.

Very large; monstrous; astonishing;

as, a

whapping

story

[Colloq.]

whopping ‎(not comparable)

exceptionally large or great
It weighed a whopping 700 pounds, when it was full.

exceptionally large or great

whopping

whopping ‎(plural whoppings)

A beating.
- (Can we date this quote?) Frederic H. Finnis, Turning Back the Pages 1993-1923 (page 6)
  At least this taught me to hate violence which to me translated into thick ears or sound whoppings on the behind.