The Collaborative International Dictionary of English v.0.48:

Fanfaron \Fan"fa*ron\, n. [F., fr. Sp. fanfarron; cf. It.
   fanfano, and OSp. fanfa swaggering, boasting, also Ar.
   farf[=a]r talkative.]
   A bully; a hector; a swaggerer; an empty boaster. [R.]
   --Dryden.
   [1913 Webster]