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Webster 1913 Edition

Whacker

Whack′er

,

Noun.

1.

One who whacks.

[Colloq.]

2.

Anything very large; specif., a great lie; a whopper.

[Colloq.]

Halliwell.

Definition 2024

whacker

whacker

English

Noun

whacker ‎(plural whackers)

One who, or something which, whacks.
(informal) Anything large; a whopper.