A faux pas

French for "False Step." A severe social blunder or major breach in etiquette. If the faux pas in question was unintentional it oftens leads to a very awkward and uncomfortable moment. If the faux pas in question was intentional the person who intentionally committed the faux pas in question is often loathed for an appropriate period of time (or bitch slapped). But- on a rare occasion the person the intentional faux pas was directed at might find it funny and laugh it off.