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
You blow hard!
1. A very boastful and talkative person; a braggart
2. 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"
"Did you catch the State of the Union speech last night? What a fucking blowhard!"
an opinionated person who talks loud and way too long on the same subject, often sensationalizing the subject matter
blowhard: insert photo of rush limbaugh
Someone who speaks loud and long, offering an opinion YOU disagree with.
That blowhard thinks the Red Sox can come back from a 3-0 deficit. Geez!
Someone who likes to shamelessly talk out of their ass.
Bill O'Reilly from Fox News is a blow-hard.
Someone who talks a lot.
My neighbor is a real blow hard, he starts telling his stories and I can hardly get away before he stops talking.
A person that is known to rant and rave about things. Their opinions are usually ignorant and lack evidence. The term comes from the literal meaning of "blowing hard". If you blow hard enough people pretty much have to listen.
Famous blow-hards include Glenn Beck and Dr. Phil.
An uptight person. Square. By the book. Ass hole.
My neighbor across the street complains about the loud music, he is a real blow hard.