"The Bee's Knees": Origin and Meaning of 1920s Slang

"The bee's knees" is 1920s American slang meaning excellent, outstanding, the best. Similar phrases: "the cat's pajamas," "the cat's meow."

Origin theories:

• Playful nonsense rhyme (bee's knees → "the business").
• Reference to pollen baskets on bees' legs (corbiculae) – concentrated goodness.
• Corruption of "the be-all and end-all."

Used as high praise for people, objects, or ideas. Now vintage/ironic.