whomp on
1. To beat up. While I was away at camp, I didn't miss my older brother whomping on me and giving me noogies whenever mom's back is turned.
2. To defeat, especially decisively. We had high hopes going into the game, but the other team totally whomped on us, giving us our first loss.
whomp up
To make quickly. I wasn't expecting company, but don't worry, I can whomp up a dinner for us in no time!