1590s, "resembling a peach" in some way, from peach (n.) + -y (2). Slang sense of "attractive" attested by 1900. Extended form peachy-keen recorded from 1953. Related: Peachiness.
例文
1. Everything in her life is just peachy .
彼女の生活のすべては素晴らしい。
2.Everything is just peachy .
すべて順調です。
3.They bought a peachy new sports car.
彼らは良い新しいスポーツカーを買った。
4.Everything is going peachy here,dad.How are you and mom?
お父さん、ここはすべてとても良くて、あなたとお母さんは良いですか?
5.I really like your peachy face,shiny eyes and cherry mouth.