whack

whack /^hw'æk/ (whacks whacking whacked)
1 [VERB] V n, V n prep
If you whack someone or something, you hit them hard. (INFORMAL)
You really have to whack the ball...
Someone whacked him on the head.
[N-COUNT; SOUND]
Whack is also a noun.
He gave the donkey a whack across the back with his stick...
2 [N-SING] oft poss N
Your whack of something is your share of it. (BRIT INFORMAL)
The majority of people in this country pay their whack...
We need to win a fair whack of the contracts.
= share