spoonerism: [19] The term spoonerism commemorates the name of the Reverend William Spooner (1844–1930), Warden of New College, Oxford, who reputedly was in the habit of producing utterances with the initial letters of words reversed, often to comic effect (as in ‘hush my brat’ for ‘brush my hat’ or ‘scoop of boy trouts’ for ‘troop of boy scouts’) [spoonerism etymology, spoonerism origin, 英语词源]