Whopper

·noun One who, or that which, whops.

II. Whopper ·noun ·same·as Whapper.

III. Whopper ·noun Something uncommonly large of the kind; something astonishing;

— applied especially to a bold lie.

whopper
Anything uncommonly large; as, 'That's a whopper,' meaning a monstrous lie. 'In angling to-day, I ca...

Dictionary of American Words And Phrases by John Russell Bartlett.
whopper
a thumper, any thing uncommonly large. North. ...

A glossary of provincial and local words used in England by Francis Grose