Unusually fine; dandy.
How are you doing on this lovely Monday day, my dear friend?
Why, peachy keen, of course, my dearest friend. And you?
Just swell. Dandy and spiffy, as well.
by PeachyKeen July 10, 2003
An exclamation used when something is going okay, sometimes used sarcastically.
That shot, the one that missed the goal, that was just peachy keen.
by Anonymous July 8, 2003
adj. Enthusiastically supportive of impeachment.

.............
The peachy keen folk are starting to drool on their entitlements.
by gnostic3 March 28, 2021
Having everything work out perfectly and in harmony with your entire existence...then waking up.
Oh, man. Last night I had a real peachy keen dream.
by Obnubilater March 13, 2008
A cute little fun way to say you are 'keen' about something in a rhyming way.

It can be used in a sarcastic or a genuine tone, how you use it is up to the interpreter.
Josh: "Are you excited for Caitlyn's party"

Y/n: "I'm 'peachy keen jelly bean'!"
by Jord Jean May 31, 2021