A characteristic or action that is homosexual beyond redemption.
Autofag cannot be reversed by any explanation, justification, ect. If you have been Autofagged, you ARE a faggot.
John: "Wow, did Henry really just wear pink shorts to school for the third day in a row?"
Henry: "Dude, I haven't washed any of my other clothes yet, cut me some slack."
John: "Nope. Autofag!"
Sam: "Don't try to justify your homosexuality with logic. AUTOFAG!"