This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Alternative form of whopper.

n. Something uncommonly large of the kind; something astonishing; -- applied especially to a bold lie. Now (1998) usually spelled whopper.

"Her eye wandered to the further woodland, softest of all in hazy veils; to the nearer brilliant vegetation; the open fallow; the wood behind her, where the trees closed in upon each other; oftenest of all, at the 'whapper' of a tree in which Mr. Linden still kept his place, and at the happy busy sight and sound of all under that tree."

whopper