Here is the FIFTH of the 'Five Love Adventures of Solomon Slug' by David L. Roath, from 1852 -- the story of 'Miss Jinks,' featuring the most -- ummm -- unique romantic serenade of all time.
Oh yes, the expression "O. P. H."? While lost in antiquity, we can assume that back in 1852, everyone knew it meant "Out Post Haste."