Discuss and learn French: French vocabulary, French grammar, French culture etc.
I think your word is un faux pas.
Pronounced "fo pah"
faux pas- also used in English as Faux pas to mean you messed up- put your foot in it
Translating as "false step"--In English, it has become a prefix adjective for meaning "fake", too, as in "faux fur" (fake fur).