Green’s Dictionary of Slang

(orig. US) arrogant, loud-mouthed, occas. as n. (see cite 1883); thus braggadociousness n.

1851		Louisville Dly Courier (KY) 15 Jan. 3/2: The disturbance of an audience [...] by loud and offensive braggadocious and conspicuous gestures and head-shakings.
1860		Pomeroy Wkly Teleg. (OH) 31 Jan. 3/2: The croakings of the Raven have no longer any terror for us, and the braggadocial style has losts its effect.
1869		Dly Phoenix (Columbia, SC) 17 Feb. 4/1: ‘S’death! the rascally gray-beard questioned us!’ interrupted the younger horseman, a braggadocious private.
1873		Wkly Caucasian (Lexington, MO) 26 Apr. 2/2: The facts do not justify the braggadocious style of the dispatches.
1883		Middlesborough Register (VT) 12 Jan. 3/2: In spite of his braggadocious, the major yielded.
1892		Princeton Union (MN) 4 Aug. 6/2: The braggadocious lose their lives in a Mexican vocano.
1893		York Herald 11 Feb. 9/6: I was glad to see the beating you gave that braggadocious card-player [...] what a beastful animal he is.
1906		Jimplecute (Jefferson, TX) 14 July 1/3: As to the report that we used any braggadocious language at the station [...] that is also false.
1914		Eve. Star (Wash., DC) 27 Sept. 13/1: The Canadian who joins the army is no braggadocious chap who sees himself coming home diked out in the glories of war.
1916		J.G. Cruickshank Black Talk 24: But look at this boy! He too bragga!
1942		L. Bennett ‘A Gran Sinting’ in Jam. Dialect Poems 26: Yuh wi full a braggadoshusness / Be time de curtain drop.
1946		Mezzrow & Wolfe Really the Blues 44: I don’t want to sound braggadocious, but for a while I was doing so good I almost hired Wells Fargo to haul my gold around.
1960–82		L. Bennett Auntie Roachy Sey (2003) 5: Come een like Suzy Westcut braggadosha bredda Bulla, who turn truck driver an always a boas bout how nobody bancyaan drive truck good like how he can drive truck, an omuch wagga-wagga money him meck outa drivin. Mmmm.
1972		C.E. Palmer Wooing of Beppo Tate 102: If it’s a big one as this braggadocio cow has set itself [...] there can be fireworks in the throat region.
1995		L. Stavsky et al. A2Z 12/1: bragadocious – boastful, conceited: Back in the day rap was considered by some as a bragadocious thing.
2000		W. Shaw Westsiders 289: ‘It’s a kind of like a braggadocious thing,’ Al suggests, meaning that it’s in the battle-rap tradition, a rapper boasting of his chops, demonstrating his superior wordplay.
2002		‘Touré’ Portable Promised Land (ms.) 160: We Words (My Favorite Things) [...] Braggadocious.
2012		Izikhotane News (S. Afr.) 23 May 🌐 Styling bravado and bragadocious lyrics apart the ukukhothana trend is mostly practised by people from disadvantaged backgrounds.