She acts as if everything in her life is 'peachy keen' [='peachy'], but I don't think she's really happy.
“It's starting to rain.” “Oh, that's just 'peachy'! What are we going to do now?”
For the first few months of their marriage, everything was 'peachy'.
(..) - What are you talking about? You want to make me beg? No. All l want is an explanation. l just smashed my cab and lost my job. Besides that, everything is peachy! Thanks for asking. Would you just explain calmly? You don't know you won a trip to Fhloston for two for ten days? (..)1997 The Fifth Element