bees' knees
When bees flit from flower to flower the nectar sticks to their legs. The phrase "bee's knees" means sweet and good, because the knees of the bee are where all the sweet, good stuff is collected.
That definition about moving around really fast is wrong.
Synonyms for bees knees
On this page, you will find 30 slang terms related to bees' knees. Some of the top words include: donce, Shootin' The Beaver, Swang, lolerskates, drazen, and 25 more.