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If you describe someone as a blowhard, you mean that they express their opinions very forcefully, and usually in a boastful way. 吹牛者
[美国英语][非正式]
例：
He doesn't like to be a blowhard about what he's developed.
"For every opinion there is a counter-opinion. Someone says 'oh,he was a blowhard;' someone else says 'he was a charming,sweet guy.' I think the truth is in between;
VOA: standard.2009.12.17
For that reason, the kids called him Eber Blowhard, or just "Blow" for short.