Fleshly can mean corporeal, corpulent, gross, or sensual. We can assume that Gilbert meant that Bunthorne (or at least his poetry) was sensual, i.e., carnal -- in a Victorian way--as opposed to the idyllic poetry of Grosvenor; whereas the term when later applied to the Dragoon Guards ("They are fleshly men of full habit!") surely implies gross. Under the entry "The Fleshly School" in Brewer (54) we read of Robert Buchanan's violent published attack on the poetry and literary methods of Swinburne, Rossetti, Morris, and others of their ilk. Buchanan apparently coined the term, with Rossetti particularly in mind.