thump on (someone or something)
To beat or pound on someone or something with force. The two brothers thump on each other all the time, but they're really very close. The manager thumped on the table to bring some order to the meeting.
thump on someone or something
to pound on someone or something. Tim was angry with Roger and thumped on him a little, but decided to forgive him. Andy thumped on the bass drum for an hour.