Reference to scientologists.

A scientologist, in lolcat-speak. More generally, anyone stupid enough to buy ad space on UrbanDictionary.com that will show beside definitions like this one. Yes, as of April 2008, the Church of Scientology thinks this is a good idea.

LOL WUT?

Sci-Fag relates to all members of Scientology being disliked. The original root word "Fag" comes from the word faggot, which means bundle of sticks. The bundle of sticks is refering to the sticks that people would collect before they were burnt at the stick, so the word fag or faggot is a violent and obscene way of saying I want you to be burned at the stick.

Scifag is a derogatory term for a person obsessed with Scientology.

Detailed definition:
The word 'scifag' is a portmanteau on the words 'Scientology' and 'fag', the latter being short for 'faggot', a derogatory term for homosexuals. The wording of (noun)-fag carries the meaning of being 'gay for (noun)', which in turn means 'to be obsessed with (noun)', e.g. a Gucci-fag is a person obsessed with Gucci products.

The word scifag therefore describes someone who is 'gay for Scientology', meaning they are obsessed with it. It is likely that it was derived from a similar, pre-existing term also about a religion, namely Cristfag (someone gay for Jesus Christ, and in extension, Christianity)

A stupid and sad piece of fuck believing in the bunch of lies and poo that is called "Scientology".

Reference to Scientologists. Especially those who are the types to write into papers or comment on web sites spewing their cultish propaganda.