Blowhard

[Tina]

A very boastful and talkative person; a [braggart]

A self-important egomaniac who likes to toot his own horn, like those assholes who put bumper stickers on their cars that say PROUD PARENTS OF AN HONOR STUDENT AT (blah blah blah) HIGH SCHOOL

[Britney]

an opinionated person who talks loud and way too long on the same subject, often sensationalizing the subject matter

[Kit]

Someone who [speaks] loud and long, [offering] an opinion YOU [disagree] with.

[Sommer]

[Someone] who brags [all the time].

[Dianne]

A person who takes great pleasure in [boasting] or [bragging] about [themself].

[Gregory]

someone who talks a [big game] for the sole pleasure of instigating an argument without [rational] [back-up] to his/her point(s).

[Mark Zuckerberg]

A word that [sounds] [sexual] but [isn]’t

[Gregory]

A boastful or pompous person.

[Sonia]

As mentioned in another definition, a very [braggy] and pretentious person, overly [prideful] and arrogant. See [egotist].

Also could be an insult to anyone; the definition of this other insult is totally unrelated to boasting or bragging. We all know what blow means.