A derogatory term for a Christian considered to be overly focused on the Bible and/or aggressively evangelistic. Primarily heard in US. After Mary started spending more time with her church's youth group, her friends from school began to complain that she had become a bit of a Bible-thumper

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.