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Webster 1913 Edition

Verb.

[

imp. & p. p.

Whacked

;

p. pr. & vb. n.

Whacking

[Cf.

To strike; to beat; to give a heavy or resounding blow to; to thrash; to make with whacks.

[Colloq.]

Rodsmen were

whacking

their way through willow brakes.

G. W. Cable.

Verb.

To strike anything with a smart blow.

To whack away

to continue striking heavy blows;

as,

to whack away

at a log

[Colloq.]

Noun.

A smart resounding blow.

[Colloq.]

Verb.

To strike. This is probably the primary word on which is formed thwack. [See Twit.] Whack is a vulgar word.