WHOPPER
whacker, whopper
(noun) something especially big or impressive of its kind
whopper, walloper
(noun) a gross untruth; a blatant lie
Source: WordNet® 3.1
Etymology
Noun
whopper (plural whoppers)
(informal) Something remarkably large.
(informal) An outrageous or blatant lie.
Source: Wiktionary
Whap"per, Whop"per, n. Etym: [See Whap.]
Definition: Something uncommonly large of the kind; something astonishing;
– applied especially to a bold lie. [Colloq.]
Whop"per, n. Etym: [Cf. Whapper.]
1. One who, or that which, whops.
2. Same as Whapper.
Source: Webster’s Unabridged Dictionary 1913 Edition