1920, in the meaning defined above
Fanciful Words for Your Favorite Things
This list is the cat's meow
Slang Through The Ages
Find out if you’re a space cadet or the bee’s knees
“Bee's knees.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bee%27s%20knees. Accessed 3 Mar. 2025.
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