faux pas means: Faux Pas is a term that can be used to describe a type of sewing, but it is also a fashion term. Faux Pas is when you make a mistake in judgement or slip your tongue. Worst of all, it can lead to the creation or wearing of the wrong item. Avoid any sartorial error that can land you on the most unattractive list. (in Fashion Dictionary)

What else does faux pas mean?

Social blunders (in Merlin Dictionary)