ぬかよろこび
premature joy; short-lived elation
Also written 糠喜び
Noun, Suru verb, Intransitive
君きみ、本当ほんとうに企画きかく通とおったこと確認かくにんしただろうね。糠喜ぬかよろこびだけはごめんだよ。
Are you saying that our plan was accepted? I hope you're not showing me any premature happiness here.