·noun A smart resounding blow.
II. Whack ·vi To strike anything with a smart blow.
III. Whack ·add. ·noun A portion; share; allowance.
IV. Whack ·add. ·vt To divide into shares; as, to whack the spoils of a robbery;
— often with up.
V. Whack ·vt To Strike; to Beat; to give a heavy or resounding blow to; to Thrash; to make with whacks.