Je m'en fous.
I don't care.
Je m’en fous !
I don't give a shit!
Fais ce que tu veux, je m'en fous.
Do what you want, I don't really care.
Je m'en fous comme de l'an quarante.
I don't care a bean.
Franchement, ma chère, je m'en fous !
Frankly, my dear, I don't give a damn!
Je m'en fous, du moment que tu es heureux.
I don't care as long as you are happy.
Honnêtement, mon cher, je m'en fous complètement !
Honestly, my dear, I don't care at all!
Je m'en fous de ce qu'il dit. Il ne pourrait jamais arriver à faire ça.
I don't give a shit what he says. There is no way he could've pulled that off.
Je m'en fous de la politique, j'attends juste la seconde venue de Jésus-Christ.
I don't give a damn about the politics, I'm just waiting for the second coming of Jesus Christ.
Je crois que, aujourd'hui, ce que vient de dire Louis Michel était explicite - parle toujours mon amour, je t'écoute, mais je m'en fous complètement.
I think Louis Michel's speech to us today was quite explicit: talk to me honey, talk to me, I'm listening, but I couldn't care less.
Examples from Tatoeba (CC BY 2.0 FR) and Europarl (OPUS). Sentences are not reviewed one by one.