One of the mysteries of the English language finally explained.
2Also with capital initials. = "mashed potato".
Late 18th century; earliest use found in James Woodforde (1740–1803), diarist and Church of England clergyman. Probably partly from mash + potato, and partly shortened from mashed potato.
mash potato/ˌmaʃ pəˈteɪtəʊ/
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