Spenser's coinage, 1590, as a name for his personification of vainglory, from brag, with augmentative ending by analogy to the Italian words then in vogue in England. In general use by 1594 for "an empty swaggerer;" of the talk of such persons, from 1734.
例文
1. He was disliked because his manner was always full of braggadocio .
人々は彼を嫌っている。彼はいつもほらを吹いているからだ。
2.Underneath his goofball braggadocio lies a kind of purity（David Ansen）
彼の不器用な自慢には純粋さ（デビッド?アンソン）
3が含まれている。Fink：american frontiersman and folk hero known for his marksmanship，fighting skills，and braggadocio .