The Collaborative International Dictionary of English v.0.48:

jingoist \jin"go*ist\, n.
   One who is jingoistic; a bellicose patriot; an extreme
   bellicose nationalist; an aggressive chauvinist.

   Syn: chauvinist, jingo, flag-waver, hundred-percenter.
        [WordNet 1.5 + PJC]

WordNet (r) 3.0 (2006):

jingoist
    n 1: an extreme bellicose nationalist [syn: chauvinist,
         jingoist, jingo, flag-waver, hundred-percenter,
         patrioteer]