definition of
whack

[1] #1 whack v. [wham, whop, wallop] hit hard; "The teacher whacked the boy". wn

[2] #2 whack n. the sound made by a sharp swift blow. wn

[3] #3 whack n. [knock, belt, rap, whang] the act of hitting vigorously; "he gave the table a whack". wn