- jock
- 1952, short for jockstrap "supporter of the male genital organs, used in sports" (1897), from jock slang for "penis" c.1650-c.1850, probably from Jock, the nickname for John, which was used generically for "common man" from 1508. Meaning "an athletic man" is from 1963, Amer.Eng. slang.