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fistiana (n.): "anecdotes of pugilists; boxing lore," 1839, from fist (n.) + -iana.
kid (n.): c. 1200, "the young of a goat," from a Scandinavian source such as Old Norse kið "young goat," from Proto-Germanic *kidjom (cognates: Old High German kizzi, German kitze, Danish and Swedish kid). Extended meaning of "child" first recorded as slang 1590s, established in informal usage by 1840s. Applied to skillful young thieves and pugilists since at least 1812. Kid stuff "something easy" is from 1913 (The phrase was in use about that time in reference to vaudeville acts or advertisements featuring children, and to children-oriented features in newspapers). Kid glove "a glove made of kidskin leather" is from 1680s; sense of "characterized by wearing kid gloves," therefore "dainty, delicate" is from 1856.
pit (v.): mid-15c., "to put into a pit," from pit (n.1); especially for purposes of fighting (of cocks, dogs, pugilists) from 1760. Figurative sense of "to set in rivalry" is from 1754. Meaning "to make pits in" is from late 15c. Related: Pitted; pitting. Compare Pit-bull as a dog breed attested from 1922, short for pit-bull terrier (by 1912). This also is the notion behind the meaning "the part of a theater on the floor of the house" (1640s).