Someone who goes around saying to everyone that they are an atheist when they are really not sticking to their values and making a fool of themselves going to church with their family
Adam: Hey Zack, I'm pretty sure I saw you at church the other day for the Midnight Mass. Whats up with that? I thought you were an atheist!
Zack: Dude, I am an atheist but my mom wouldn't let me stay home!
Adam: Man you are definitely not. You're just a liar and a saytheist.