rumble-bumble

How pleasant it is to turn from all the rumble-bumble about a great man to the great man himself, and this is especially the case with Thomas Hardy. It is like turning from the department-store counter where they sell rose-water, passing through a door and suddenly finding oneself amid the silence, the brooding immensity, the unchangeable, untameable wildness of Egdon Heath.

1927, Canadian Bookman, volumes 9-10, page 265

Of late the professors of semantics have divided into two factions. The first, led by metaphysicians, lifts the elemental business of communicating ideas to the level of a baffling and somewhat sinister arcanum standing midway between the geometry of the fourth dimension and the Freudian rumble-bumble; the other, led by popularizers, converts it into a club for use upon the skulls of enemies of the current New Deals.

1945, Henry Louis Mencken, The American Language, page 102