[spoo-nuh-riz-uh
m] 
| the transposition of initial or other sounds of words, usually by accident, as in a blushing crow for a crushing blow. |
| spoon·er·ism (spōō'nə-rĭz'əm) n. A transposition of sounds of two or more words, especially a ludicrous one, such as Let me sew you to your sheet for Let me show you to your seat. [After William Archibald Spooner (1844-1930), British cleric and scholar.] |
A reversal of sounds in two words, with humorous effect. Spoonerisms were named after William Spooner, an English clergyman and scholar of the late nineteenth and early twentieth centuries. In one spoonerism attributed to him, he meant “May I show you to another seat?” but said, “May I sew you to another sheet?”