The practice of intolerant religious fundamentalists (fundies)to type in ALL CAPS, frequently with poor or missing grammatical skills, in an online chat room or message posting, presumably proving their viewpoint superior to others.
Also can be used to ridicule others who inadvertently hit the Caps Lock key by accident and don't notice before they hit Enter.
Agnstic1: But there's no dispute in the scientific world about evolution.
GdHtsfags: YES THER IS! MY PREECHER TOLD ME BUT THATS OK BECUSE YUR GOINGSTRAIHT TO HELL JESUS IS LOVE!
Agnstic1: Ssiighhh...yeah. Whatever.
Bob1: So what happened after we hit the bar?
Dave2: Well afTER WE WENT HOME SHE GAVE ME THE GREATEST BLOWJOB IN HISTORY!
Bob1: Woah man, dropped into fundie mode there.
Dave2: Oops, lol. Hey, that BJ was worth all caps.