the.com/blowhard

A man whose confidence and competence took separate flights, and only one landed.

means Someone who brags loudly and boastfully, especially about things they can't actually back up.

from A 19th-century American sailor's term, originally naval slang for a blustering storm or a blustering person — the image is of someone all wind, like gale-force bluster with nothing solid behind it. 'Blow' for wind and bragging talk, 'hard' for the intensity — it came ashore from sea-faring speech into everyday insult, and stuck.

origin
1800s sailor slang for boastful windy types
tell
volume rises exactly when facts run out
habitat
thrives at open bars and office meetings
cure
one direct question about specifics
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