Etymology
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jockey (n.)

"person who rides horses in races," 1660s, a specific use of the earlier sense "boy, fellow" (1520s), which is a special use of the Scottish proper name Jockey, a familiar or diminutive form of Jock. Jockey-boots are from 1680s; jockey-shorts "abbreviated underwear for men" is from 1935 (jockey-briefs from 1946).

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disk (n.)

1660s, "round, approximately flat surface," from Latin discus "quoit, discus, disk," from Greek diskos "disk, quoit, platter," related to dikein "to throw" (see discus).

The American English preferred spelling; also see disc. From 1803 as "thin, circular plate;" sense of "phonograph disk" is by 1888; computing sense is from 1947. Disk jockey first recorded 1941; dee-jay is from 1955; DJ is by 1961; video version veejay is from 1982. Disk-drive is from 1952.

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jockey (v.)

1708, "trick, outwit, gain advantage," from jockey (n.) perhaps in its former secondary sense of "horse trader" (1680s) and reflecting their reputation. Meaning "to ride a horse in a race" is from 1767. Related: Jockeyed; jockeying.

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DJ (n.)

also dee-jay, abbreviation of disk-jockey (see disk), attested by 1961.

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jock (n.)

1952, short for jockstrap "supporter of the male genital organs," which also meant, in slang, "athletic male." Jock with the meaning "an athletic man" is from 1963, American English slang. A jockette (1948) originally was a female disk jockey, then a female jockey (1969), then an athletic female (1979).

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DOS 

"computer operating system using a disk storage device," 1967, acronym of disk operating system.

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diskette (n.)

"floppy disk," 1973, from disk with diminutive suffix -ette.

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gold (adj.)

c. 1200, from gold (n.); compare golden. In reference to the color of the metal, it is recorded from c. 1400. Gold rush is attested from 1859, originally in an Australian context. Gold medal as first prize is from 1757. Gold record, a framed, gold phonograph record to commemorate a certain level of sales, is from 1948.

Joe Grady and Ed Hurst, WPEN disk jockey team, will be given a gold record by Mercury of the one-millionth copy of Frankie Lane's waxing of That's My Desire, January 10, for having done so much to plug the platter in these parts [Philadelphia]. [Billboard magazine, Jan. 10, 1948]
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veejay (n.)

1982, from pronunciation of V.J., from video, on model of deejay (see disk).

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middleweight (n.)

also middle-weight, "boxer or jockey of intermediate weight" (between a lightweight and a heavyweight), 1842, from middle (adj.) + weight (n.).

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