Bee's Knees Meaning

(idiomatic, dated, usually with the) Something or someone excellent, outstanding.

Example: Used other than as an idiom: see bee,‎ 's,‎ knee.
  We had strawberry shortcake for breakfast on Saturday and the kids thought it was the bee's knees.
  I used to play in a band when I was younger. We had a few fans and we thought we were the bee's knees.
  There is a new bee's knees every few minutes in New York.