Whack (?), v. t. [imp. & p. p.Whacked (?); p. pr. & vb. n.Whacking.] [Cf. Thwack.] To strike; to beat; to give a heavy or resounding blow to; to thrash; to make with whacks.
Rodsmen were whackingtheir way through willow brakes. G. W. Cable.
Webster's Dictionary 1913
Whack (?), v. t. [imp. & p. p.Whacked (?); p. pr. & vb. n.Whacking.] [Cf. Thwack.] To strike; to beat; to give a heavy or resounding blow to; to thrash; to make with whacks.
Rodsmen were whackingtheir way through willow brakes. G. W. Cable.