This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

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.

n. A play on words on a phrase in which the initial (usually consonantal) sounds of two or more of the main words are transposed.

n. transposition of initial consonants in a pair of words

"This is curious, for it seems, on the evidence of those who knew him best, that the spoonerism was a verbal felicity which he did not perpetrate."

slip of the tongue