E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Affected simplicity. Lady Emily, in the Heiress, tells Miss Alscrip the way to acquire the paphian Mimp is to stand before a glass and keep pronouncing nimini pimini. The lips cannot fail to take the right pile. (General Burgoyne, iii. 2.)
This conceit has been borrowed by Charles Dickens in his Little Dorrit, where Mrs. General tells Amy Dorrit
Papa gives a pretty form to the lips. Papa. potatoes, poultry, prunes, and prism. You will find it serviceable if you say to yourself on entering a room, Papa, potatoes, poultry, prunes, and prism, prunes and prism.