big lie; whopper
Refers to an outrageous, exaggerated lie or tall tale. Often used in the phrase 大ぼらを吹く (to tell a big lie/whopper).
He's telling another big lie.
That story is probably a whopper anyway.
braggart; big talker; blowhard
Common mixed kanji-kana spelling; ぼら is usually written in kana.
Katakana variant of ぼら, sometimes used for emphasis or in casual writing.
Full kanji spelling; 法螺 is a rare ateji for ぼら (conch shell, tall tale).
From 大 (big) + ぼら (conch shell, tall tale). ぼら originally referred to a conch shell used as a horn, and by extension came to mean 'boasting' or 'tall tale'.