大ぼら吹き
Meanings
1
braggart; big talker; blowhard
A person who habitually tells exaggerated stories or boasts; often used in a derogatory or humorous way. The 大 (big) intensifies the base word ほら吹き (braggart).
See also: ほら吹き
He's a big talker, so you'd better take what he says with a grain of salt.
Nobody takes that blowhard's stories seriously.