You have just committed one. A faux pas is an embarassing mistake usually made as a result of ignorance or lack of manners. Using French expressions wrongly would come into that category. Others would be telling racist jokes at the wrong time, shaking hands wearing gloves, calling your girlfriend's mother Babe, etc,etc The literal meaning of faux pas is false step. It is pronounce foh pa.
"n'est pas" means "is not" in English.
pas is not and pa is like father or dad so it means not dad.
il n' aime pas mean he does not like
On n'est pas des anges means "we are no angels" in English.
Ce n'est pas bon means 'this isn't good'.
"Pas bon" = "Not good"
"pas sale" means "not dirty"
"Pas pire" means "not worse".
Touche pas --> Do not touch
"n'est pas" means "is not" in English.
tu n'es pas gentil, pas gentille
You can say "Je n'ai pas" in French to mean "I don't have."
N'est-ce pas means "isn't it" in English.
pas trés bien - not very well
Ne m'oubliez pas means 'don't forget me'.
n'est-ce pas means isn't it in French.
Pourquoi pas means 'why not?' in English.