Someone who:
Has a bracelet,bumper sticker,t-shirt, etc with Christian phrases on it.

Is a born again Christian.

Goes to church.

Talks freely to many people about their beliefs.

Has the fire of Jesus in their heart.

One who is passionate about Jesus and is unashamed enough to share with others what he has done in his or her life. They do not care what others think of them for being a follower of Jesus. Although, sadly, some are rude and unloving in the way they treat others and share their faith with others, those who are truly Christlike humbly admit that they are not perfect and that's why they need a savior. Usually used as a derogatory term.

People of the Christian faith who become fanatical in their beliefs, eventually driving away friends with different religions, sexual preferences, ect. Note that not all Christians are like this.

While these people aren't "Bad" people,they are usually intolerant to others religious beliefs. They tend to tell those of other religion that they are going to Hell and that they need to convert to Christianity. These can also be those who preach about their respective denominations. There is also a possibility that they could be homophobic.

someone evincing 2 or more of the following symptoms:
1: proclaims the lord is coming with the imminent end of the world
2: has signs on their person, car, or home with bible quotes
3: goes to church more than once a week
4: started their own christian offshoot cult because the rest aren;t pious enough
5: tries to foist an extreme form of christianity off on others
6: is a born-again christian and/or fundamentalist

1. Someone who worships Jesus everyday. Someone who isn't just a "Christian" on a Sunday.
2. Someone who recognizes the misery and despair in the world and decides to do something about it. Someone with a spine that actually gets up and does something about all the suffering and pain in the world.
3. Someone who doesn't withold the Word from others or bash those who spread it.
4. Someone with a spine.

This is a phrase which i believe should be explained in this song, which was written by dcTalk and is from the album "Jesus Freak" that sold platinum in 1995:

Separated, I cut myself clean
From a past that comes back in my darkest of dreams
Been apprehended by a spiritual force
And a grace that replaced all the me I've divorced

I saw a man with tat on his big fat belly
It wiggled around like marmalade jelly
It took me a while to catch what it said
Cause I had to match the rhythm
Of his belly with my head
'Jesus Saves' is what it raved in a typical tattoo green
He stood on a box in the middle of the city
And claimed he had a dream


(chorus)
What will people think
When they hear that I'm a Jesus freak
What will people do when they find that it's true
I don't really care if they label me a Jesus freak
There ain't no disguising the truth

Kamikaze, my death is gain
I've been marked by my Maker
A peculiar display
The high and lofty, they see me as weak
Cause I won't live and die for the power they seek

There was a man from the desert with naps in his head
The sand that he walked was also his bed
The words that he spoke made the people assume
There wasn't too much left in the upper room
With skins on his back and hair on his face
They thought he was strange by the locusts he ate
The Pharisees tripped when they heard him speak
Until the king took the head of this Jesus freak

(repeat chorus 2x)

People say I'm strange, does it make me a stranger
That my best friend was born in a manger
People say I'm strange, does it make me a stranger
That my best friend was born in a manger

(repeat chorus 2x)

What will people think
(What will people think)
What will people do
(What will people do)
I don't really care
(What else can I say)
There ain't no disguising the truth
(Jesus is the way)

Someone who tries to be both part of an anti-social subculture (see punk for a good example) and a Christian, not realizing that you can't support the ideals used in punk and be a Jesus follower at the same time.

Jesus Freak: not, as many seem to believe, any christian. most christians are okay. but jesus freaks are in a class of their own. every religion has the fanatics, and the reason christianity has one with a name is because the religion is in the government and ruining peoples lives... ahem. anyway, a jesus freak is a christian who a)thinks anyone who isnt christian is a satanist, b)thinks they have to kill these "Satanists", c)is a homophobe (if theyre a homophobe because that's what the LORD says...x.x), d)goes around pushing christianity on everyone and tries to "save" everything thats alive and non-christian, e)puts people down because of what they where or say or listen to if they think its going against the lord or something, and/or f) thinks god will sort the dead out and therefore doesnt care if they or someone else dies.

Originally, dating back to the late 1960s and early 1970s, it was a term used to describe counterculture people, or hippies, aka "freaks" who were part of the Jesus movement. However, later on it was used as a pejorative against anyone who was a particularly devout Christian and especially vocal about it, even if they were rather square and quite the opposite of counterculture or hippies. This is typically how the term is used today.