spoonerism

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spoonerism = Reversal of the initial letters or syllables of two or more words, such as “I have a half-warmed fish in my mind” (for “half-formed wish”) and “a blushing crow” (“a crushing blow”). The word is derived from the name of William Archibald Spooner (1844–1930), a distinguished Anglican clergyman and warden of New College, Oxford, a nervous man who committed many “spoonerisms.” Such transpositions are often made intentionally for comic effect.

See Woonerism on Sikipedia.