Uhmmmm, Leadfingers, the phrase you may be thinking of is "Peace Out!"

There is another phrase in which a word that rhymes with 'luck' is is teamed with the word 'off', but I don't think that is applicable here.

And let's not put that "leaving for good" idea out there. Instead let's promote the idea "stay for [the] good"!

That's why I agree "Let there be Peace in the Mudcat Valley."