The word of approval. The first meaning is "beautiful person", that means the beaty of the beahvior and ect. When somebody say that did or made something, the approve of this actions in meaning "yes, u made it right!" u may say this phrase.also is used with adjective 'absolutely', e.g. absolutely krasawa!

The full meaning is "clever boy"

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.