To hit something or someone very hard.
He whop him on the head with a bat.
他用球棒打了他的头。
To easily win against someone.
She whop her opponent in the chess tournament.
她在国际象棋比赛中打败了对手。
An exclamation showing surprise.
Whop, I didn't see you there!
哎呀,我没看到你在那儿!