To hit something or someone very hard.
He whop him on the head with a bat.
他用球棒打了他的頭。
To easily win against someone.
She whop her opponent in the chess tournament.
她在棋賽中擊敗了對手。
An exclamation showing surprise.
Whop, I didn't see you there!
哎呀,我沒看到你在那裡!