blowhard

can be think as blow-word -> blowing words -> means talkative

blowhard - like we say in hindi fekta hai saala :) or fek(blow) raha hai

blow + hard -- imagine someone who blows words in a way as if he is blowing air -- too many words, hence talkative.

(blow)ing his own trumpet (hard). One who boasts himself.

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imagine a person blowing(boasting) that he is hard but instead he is weak..

from the proverb - one who blows his own trumpet