Here's the breakdown:
* Faux: French for "false" or "fake."
* Faux pas: A social blunder or mistake.
Therefore, "faux faux pas" means a "fake" or "false" social blunder. It's often used to describe a situation where someone pretends to make a mistake to get a reaction, or when someone makes a seemingly awkward comment that is actually meant to be funny or ironic.
Think of it as a "fake" faux pas - a misstep that isn't actually a misstep at all.