Top Definition
An Atheist who has absolutely no patience for religious people, mainly Christians. They will talk crap about Christians all day, then get super pissed when anybody says a thing about Atheism, or even just stands up for their own religion. About 30% of Atheists are also Asstheists, and generally give the respectable Atheists a bad name.
Being Atheist is cool, being Asstheist is not.

The only reason you should Thumbs-Down this definition is if you are an Asstheist.
by Slayn June 17, 2007

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.