Spoonerism

A spoonerism is an occurrence in speech in which corresponding consonants, vowels, or morphemes are switched (see metathesis) between two words in a phrase. These are named after the Oxford don and ordained minister William Archibald Spooner, who reputedly did this.

An example is saying "The Lord is a shoving leopard" instead of "The Lord is a loving shepherd" or "runny babbit" instead of "bunny rabbit." While spoonerisms are commonly heard as slips of the tongue, they can also be used intentionally as a play on words.

Spoonerisms were already being used as such by the 16th century by the author François Rabelais and called contrepèteries. In his novel Pantagruel, he wrote "femme folle à la messe et femme molle à la fesse" ("insane woman at mass, woman with flabby buttocks").