swaggerer       
noun [ C ] uk/ˈswæɡ.ər.ər/ us/ˈswæɡ.ɚ.ɚ/
 昂首阔步者, 大摇大摆者,狂妄自大者, 吹牛者
someone who behaves in an extremely confident way and thinks they are very important
  He was never a swaggerer. 他从来就不是个自大狂。 
 See: swagger
 - More examples
 - Nedda's lover on the side, Silvio, is a shy bespectacled anorak in a bobble hat rather than the usual preening swaggerer .
 - Tony - chief swaggerer, babe magnet - is good at everything, including getting to school bright and early.