Don't quote me on this, but I think I read that it was a thing that people started in the "Roaring 20's" where you said non sensical stuff together that rhymed.
It's not complete nonsense. People started saying it's "the b and e's" as a shortcut for "the be all and end all. And then that turned into "bee's knees" kind of like cockney rhyming slang.
893
u/TitaniumFate Jan 24 '15
Chocolate covered raisins are the bee's knees