be the bee's knees

be the bee's knees

To be exceptionally great, excellent, or high-quality. Have you ever tried the pistachio gelato at this place? It's absolutely the bee's knees! I'm so crazy about the girl I've started seeing. I think she's the bee's knees, and I don't care who knows it!
See also: knee

be the bee's knees

  (British & Australian informal)
to be extremely good Have you tried this double chocolate-chip ice cream? It's the bee's knees, it really is.
See also: knee