That's literally the most awesome thing I've read today, for all intensive purposes!

..... for all intents and purposes.

Christ, enough with the pedantry.

If it once was "credible" but no longer is, perhaps a more appropriate term is "uncredible" or "decredible".

Of course, that woudl imply that the act of removing credibility from something would be "decrediblizaiton" or "decredencing".