"The top of the morning" refers to the zenith, which occurs around noon, when the sun is at its most intense. Sarcastic folk whose skin would burn more easily might greet their enemies with this phrase.
Making stuff to distract myself from existential dread
Art: @graham-illustrations
Dreams: @graham-dream-journal
Wizards: @make-up-a-wizard
Partner's Pottery: @kp-pottery