The sentence 'Oh non, tu es fou' means Oh no, you're crazy. In the word-by-word translation, the interjection 'oh non' means 'oh no'. The personal pronoun 'tu' means 'you'. The verb 'es' means '[you] are'. And the adjective 'fou' means 'crazy'.
"you're crazy / barmy / insane"
This looks like "tu es fou" which is literraly "you are mad" (in a nice way)
my dear co-tenant / roommate, you're barmy.
tu es fou / folle, vous êtes fou(s) / folle(s) (you formal or plural)
Alors tu es fou
Papa, tu es fou.
oh my God!!
It means, "No, you are."
"tu es si fou / folle dans tes textos"
"tu es si fou / folle dans tes textos"
It means: "The prettiest is oh it is my precious little thing"
i think it is "how is your life?" No. 'Como duele' = 'how it hurts' 'Oh well' is English 'Asi es la vida' = 'That's life'.