gambol n.

side-piece of an opening of a door, window, etc., early 14c., from Old French jambe "pier, side post of a door," originally "a leg, shank" (12c.), from Late Latin gamba "leg, (horse's) hock," which is from Greek kampē "a bending," (on notion of the bending of the joint), from verbal stem *kamp- (source also of also Lithuanian kampas "corner," kumpti "to bend," kumpas "curved," and also Germanic words for "lame, mutilated" such as Gothic hamfs "mutilated, lame," Old High German hamf). Beekes considers this a Pre-Greek or other substrate word. The Greek word also was borrowed in Albanian as këmbë "leg, foot."

"offensively abusive, wantonly irreverent, coarse, obscene," of persons, conduct, speech, etc., c. 1500, from obsolete noun ribald, ribaud "a rogue, ruffian, rascall, scoundrell, varlet, filthie fellow" [Cotgrave], mid-13c. (late 12c. as a surname), attested from late 14c. in the sense of "one who uses offensive or impious language, one who jests irreverently."

This is from Old French ribaut, ribalt "rogue, scoundrel, lewd lover," also as an adjective, "wanton, depraved, dissolute, licentious," a word of uncertain origin, perhaps (with suffix -ald) from riber "be wanton, sleep around, dally amorously," from a Germanic source (compare Old High German riban "be wanton," literally "to rub," possibly from the common euphemistic use of "rub" words in venery, from Proto-Germanic *wribanan from PIE root *wer- (2) "to turn, bend").

Other early adjectival forms were ribaldous "riotous, unruly" (c. 1400); ribaldy (early 15c.).