merde (MEHR|duh) = shit
putain (pooh|TAHN) = damn
Foutre/ Je m'en fou (FOO-truh)/(Juh MONH foo)
You'll most often hear this in the phrase “je m'en fou,” which essentially means “I don't give a fuck.”
Ta Gueule! (THAI-gull)
This is just about the rudest way possible of telling someone to shut up.
Casse-toi! (KASS-twah)
This insult is kind of like a very rude way of saying “bug off,” or maybe even “fuck off.”