two definitions:

1) Someone who is extremely evangelical in their religious belief. Many of them believe that their denomination is the one true denomination, and all others are wrong or evil. They try to make you feel like your life is a waste and use scriptures that have nothing to do with what they're saying to "explain" themselves.

2) Someone who screws with a very religious person.
Dude 1: "dude, freaking bible thumpers don't know what they're talking about!"

Dude 2: "dude, you are a bible thumper! Didn't you get with that devout christian girl?
by TechnoForEver July 9, 2009
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a christian male or female whos view of right and wrong is completely out of wack.believes that every single thing in the bible is a law to be followed or you go to hell.(im christian, but these biblethumpers are just psycotic)
i bet a bible thumper would read that part of the bile that says you can enslave your family and would do it.

bible thumper:you cant watch south park!its against christianity!!your going to hell!
me:dude, where does it say in the bible i cant watch a tv show?
by the rekad playa July 12, 2004
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When people use the bible as an excuse to push their religion on others of different religions or non-believers to make them feel bad or wrong about their actions.
You:Hello, my name is James.
Other: Hello, my name is Mary like the mother of Jesus.
You:Alrighty then so how is your day going?
Other:It's alright just got done praying at home before coming out here to enjoy God's fresh air. Uh may i ask do you pray?
You: No, I don't pray I don't believe in God.
Other:God is the most important person anywhere. He is the true word. He is the most important person he is more important than you and i. If you are not with God then you are a sinner.
You: Well, my bad but I'm sure that we can have different beliefs and still live pretty ok lives. Jeez stop being such a bible thumper
by Dezzy_Yvonne May 31, 2010
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someone who is always useing the bible to tell someone how bad they and how good the bible thumper is.
someone who tries to brow beat someone with yhe bible.
by Deep Blue 2012 August 18, 2009
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one who has extramarrietal relations with their Bible...and for those of you who dont understand that...fucks their Bible
by GC Ender January 13, 2005
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A person (to hereto be referred to as X) who is angered such by the mere existence of people who don't believe they will exist in X's imaginary place when they cease to exist for not believing in X's imaginary friend, that X will, on encountering non-X, desperately make sure to communicate X's belief that all non-X will come to exist in X's imaginary place when they cease to exist for not believing in X's imaginary friend while X will come to exist in X's 2nd imaginary place when X ceases to exist as a consequence of believing in X's imaginary friend. But this is only the beginning of the paradoxes, as despite being angered by the mere existence of non-X, believes that most non-X represents the vast majority of the human race and will therefore exist in the first imaginary place when they cease to exist while only they and their friends will exist in the second imaginary place when they and their friends don't exist. Also paradoxically, X firmly believes in the critical importance of 10 arbitrary rules of conduct, even though they make absolutely no difference according to X's own beliefs as to which imaginary place an individual is comes to exist in when that individual ceases to exist. More paradoxes include the condoning of the crusades despite these 10 rules of conduct, the belief that not only the first religion that theirs grew out of but the third one that appended onto their own are both inherently evil while theirs is good, the belief that the guidebook containing these 10 rules of conduct and much other paradoxical material contains no paradoxes or self-contradictions whatsoever despite the ease of finding references that clearly point out numerous such self-contradictions, that every scientific theory of the last 500 years, except POSSIBLY excluding the theory of gravity, IS completely self-inconsistent, and yet that science somehow exists for the purpose of glorifying X's imaginary friend, and often appeal to the superficial knowledge of the parts of this science that doesn't flagrantly contradict with their beliefs in their attempts to deride the rest of this science which they denounce entirely.
How to deal with Bible-Thumpers:
Method 1: Tell him you don't agree with him. Then follow it up with explaining why everything he believes in is all a crock of nonsense invented by a cult of bronze-age savages if you're harsh, debunk his claims, one by one if intermediate and if you're gentle, just try to persuade him that nothing he can say can convince you to believe what he does:
A few weeks ago a bible thumper came to my door and said that fish fossils were found at the tops of mountains and that it proves that there was a great flood. I told him that is the result of continental drift and that they are hundreds of millions of years old and not only don't prove there was a worldwide flood thousands of years ago but prove that the world is at least 100 thousand times as old as he says. He then said that they dated to only a few thousand years ago. I in turn told him that if he tries to use radioisotope dating to convince me that the universe is 6000 years old, that he has lost the argument before he even began it.
Pros: you'll feel superior
Cons: You're going to end up arguing for a really long time

Method 2: Nod your head and agree with him
Have you accepted Jesus as your savior?
Say "uh huh" and nod your head.

Pros: potentially get rid of him fast.
Cons: Somewhat humiliating. Can backfire especially if he then asks followup questions and tries to get you to join his bible study group.

Method 3: Put a door knocker on your door that looks like male genitalia.

Pros: Bible thumpers may decline to knock on your door in the first place.
Cons: Your neighbors and the mailman may suspect you of being a child molester. Except that neighbor up the hill who drives the Prius with rainbows painted all over it. He'll probably ask you on a date.
by thesandor July 25, 2009
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Biblethumpers are religious zealots that pillory others who progress beyond obsolescent morality. The thumping signifies limitation of literacy to only one book, a 2,000-year-old primer which they interminably struggle to read.

Bible Thumpers tend to reduce all discussions to biblical citations while ignoring contemporary science. They are also usually reactionary or conservative toward social change. For example, they are often virulently opposed to birth control, abortion, gay marriage, women's rights, and evolution.

zealot sheep fanatic biblethumper
The Bible Thumper, brainwashed by corporate media into single-issue tunnel vision, plans to defend fetuses by assassinating a pro-choice physician.
by LAlawMedMBA October 21, 2014
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