The idiom on top of the world where did this idiom come from?

Answer:
Being 'on top' of something implies happiness or delight, and 'the world' includes your life, your work, and your family. Being 'on top of the world' represents your feeling of happiness when everything in your life is going favorably.
First answer by Gaines Fox. Last edit by Gaines Fox. Contributor trust: 1110 [recommend contributor recommended]. Question popularity: 1 [recommend question].