in golf, c. 1891, originally "number of strokes a good player is supposed to need for a given hole or course;" later, "score one over par" (1946); from the same source as bogey (n.1), on the notion of a "phantom" opponent, represented by the "ground score." The word was in vogue at the time in Britain through the popularity of a music-hall tune "Hush, Hush, Hush, Here Comes the Bogey Man."
One popular song at least has left its permanent effect on the game of golf. That song is 'The Bogey Man.' In 1890 Dr. Thos. Browne, R.N., the hon. secretary of the Great Yarmouth Club, was playing against a Major Wellman, the match being against the 'ground score,' which was the name given to the scratch value of each hole. The system of playing against the 'ground score' was new to Major Wellman, and he exclaimed, thinking of the song of the moment, that his mysterious and well-nigh invincible opponent was a regular 'bogey-man.' The name 'caught on' at Great Yarmouth, and to-day 'Bogey' is one of the most feared opponents on all the courses that acknowledge him. [1908, cited in OED]
Other early golfing sources give it an American origin. As a verb, attested by 1948.
"young kangaroo," 1839, sometimes said to be from a native Australian word joè, but more recently often said to be of unknown origin. Perhaps an extended use of Joey, the familiar form of the male proper name Joseph, for which Partridge lists many common or coarse meanings in 20c. Australian slang. Farmer and Henley ("Slang and Its Analogues") quote an 1887 article on "Australian Colloquialisms":
JOEY is a familiar name for anything young or small, and is applied indifferently to a puppy, or a kitten, or a child, while a WOOD-AND-WATER-JOEY is a hanger about hotels and a doer of odd jobs.
breed of dog, a kind of sheep-dog much esteemed in Scotland, 1650s, of uncertain origin. Possibly from dialectal coaly "coal-black," the color of some breeds (compare colley, "sheep with black face and legs," attested from 1793; Middle English colfox, "coal-fox," a variety of fox with tail and both ears tipped with black; and colley, Somerset dialectal name for "blackbird"). Or from Scandinavian proper name Colle, which is known to have been applied to dogs in Middle English ("Ran Colle our dogge, and Talbot, and Gerlond" [Chaucer, "Nun's Priest's Tale"]). Century Dictionary cites Gaelic cuilean, cuilein "a whelp, puppy, cub." Or perhaps it is a convergence of them. Border-collie (by 1894) was so called from being bred in the border region between Scotland and England.
1550s, "one of the ancient sect of philosophy founded by Antisthenes," from Latinized form of Greek kynikos "a follower of Antisthenes," literally "dog-like," from kyōn (genitive kynos) "dog" (from PIE root *kwon- "dog").
Supposedly the name is a reference to the coarseness of life and sneering surliness of the philosophers, and the popular association even in ancient times was "dog-like" (Lucian has kyniskos "a little cynic," literally "puppy").
But more likely it is from Kynosarge "The Gray Dog," the name of the gymnasium outside ancient Athens (for the use of those who were not pure Athenians) where Antisthenes (a pupil of Socrates), taught. Diogenes was the most famous. Meaning "sneering sarcastic person" is from 1590s. As an adjective from 1630s.
[Diogenes] studied philosophy under Antisthenes, a crusty type who hated students, emphasized self-knowledge, discipline, and restraint, and held forth at a gymnasium named The Silver Hound in the old garden district outside the city. It was open to foreigners and the lower classes, and thus to Diogenes. Wits of the time made a joke of its name, calling its members stray dogs, hence cynic (doglike), a label that Diogenes made into literal fact, living with a pack of stray dogs, homeless except for a tub in which he slept. He was the Athenian Thoreau. [Guy Davenport, "Seven Greeks"]
late 14c., mudde, "moist, soft earth," cognate with and probably from Middle Low German mudde, Middle Dutch modde "thick mud," from Proto-Germanic *mud- from PIE *(s)meu-/*mu- [Buck], found in many words denoting "wet" or "dirty" (source also of Greek mydos "damp, moisture," Old Irish muad "cloud," Polish muł "slime," Sanskrit mutra- "urine," Avestan muthra- "excrement, filth"); related to German Schmutz "dirt," which also is used for "mud" in roads, etc., to avoid dreck, which originally meant "excrement." Welsh mwd is from English. The older word is fen.
Meaning "lowest or worst of anything" is from 1580s. As a word for "coffee," it is hobo slang from 1925; as a word for "opium" from 1922. Mud-puppy "salamander" is by 1855, American English; the mud-dauber wasp was so called by 1856. The children's mud-pie is attested from 1788. Mud-flat "muddy, low-lying ground near a shore" is by 1779. Mud-room "room for removing wet or muddy footwear" is by 1938.
The expression clear as mud (that is, "not clear at all") is by 1796. To throw or hurl mud "make disgraceful accusations" is from 1762. To say (one's) name is mud and mean "(one) is discredited" is recorded from 1823, from mud in obsolete sense of "a stupid twaddling fellow" (1708). Mud in your eye as a toast is recorded from 1912, American English.