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3.
A noun describing "religious enthusiasts"

The main distinction between a christfag and a normal polite Christian person is that a christfag's religious discussion to his or her fellow christfag will make any non-christfag bystanders who just happen to be in earshot, want to claw their own brains out.
christfag 1: Do you believe that jesus should've helped those people even though they were clearly bad and undeserving

christfag 2: Well, it IS the christian way to help everyone and love equally

bystander: (thinks) oh my god, somebody fucking kill me right now

bystander 2: YOU WANNA KNOW? WHY DON'T YOU ASK HIM YOURSELF

*bystander 2 kills both christfags and they live happily ever after*
by Dr Grammar July 06, 2010
 
1.
Someone who is gay for god.
'Look at ilikemonkeys spewing his bible bullshit again, whatta christfag."
by CIandestine December 15, 2009
 
2.
A derogatory word used on online forums for an overtly, and inappropriately, evangelizing Christian.

Someone who is "gay for Jesus".
Get out of here Christfag! Talk about Halo/Anime/Science or GTFO!
by c keitaro August 24, 2007