The phrase/word/acronym 'OK' (sometimes expressed as "Okay") comes from the Middle English repsonse to local woodchoppers enquiring of the squire "Is it permissible to chop down the stand of trees in the bottom forty?" and subsequently receiving the response, "If it's oak, aye".
For breakfast this morning I had lightly toasted antelope buttocks spread with butter made from the milk of the Indonesian pigmy elephants, all washed down with a glass of freshly squeezed kitten juice.