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OK [OK 词源字典]: OK: [19] Few English expressions have had so many weird and wonderful explanations offered for their origin as OK. There is still some doubt about it, but the theory now most widely accepted is that the letters stand for oll korrect, a facetious early 19th-century American phonetic spelling of all correct; and that this was reinforced by the fact that they were also coincidentally the initial letters of Old Kinderhook, the nickname of US president Martin Van Buren (who was born in Kinderhook, in New York State), which were used as a slogan in the presidential election of 1840 (a year after the first record of OK in print).
[OK etymology, OK origin, 英语词源]
OK: 1839, only survivor of a slang fad in Boston and New York c. 1838-9 for abbreviations of common phrases with deliberate, jocular misspellings (such as K.G. for "no go," as if spelled "know go;" N.C. for "'nuff ced;" K.Y. for "know yuse"). In the case of O.K., the abbreviation is of "oll korrect."

Probably further popularized by use as an election slogan by the O.K. Club, New York boosters of Democratic president Martin Van Buren's 1840 re-election bid, in allusion to his nickname Old Kinderhook, from his birth in the N.Y. village of Kinderhook. Van Buren lost, the word stuck, in part because it filled a need for a quick way to write an approval on a document, bill, etc. Spelled out as okeh, 1919, by Woodrow Wilson, on assumption that it represented Choctaw okeh "it is so" (a theory which lacks historical documentation); this was ousted quickly by okay after the appearance of that form in 1929. Greek immigrants to America who returned home early 20c. having picked up U.S. speech mannerisms were known in Greece as okay-boys, among other things.

The noun is first attested 1841; the verb 1888. Okey-doke is student slang first attested 1932.
top (adj.): "being at the top," 1590s, from top (n.1). Top dollar "high price" is from 1942. Top-drawer (1920) is from British expression out of the top drawer "upper-class." Top ten in popular music is from 1945 ("Billboard"). The top dog is the one uppermost in a fight, from 1868 in figurative use, opposed to the underdog.
But if the under dog in the social fight runs away with a bone in violation of superior force, the top dog runs after him bellowing, "Thou shalt not steal," and all the other top dogs unite in bellowing, "This is divine law and not dog law;" the verdict of the top dog so far as law, religion, and other forms of brute force are concerned settles the question. [Van Buren Denslow, "Modern Thinkers: What They Think and Why," 1880]
penoscrotal: "Of, relating to, or involving the penis and the scrotum", Late 19th cent.; earliest use found in William Van Buren (1819–1883). From pen- + -o- + scrotal.