Meaning of Bible-thumper

Bi•ble-thump•er

Pronunciation: (bī'bul thum"pur), [key]
— n. Informal.
  1. an evangelist or other person who quotes the Bible frequently, esp. as a means of exhortation or rebuke.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.