“Big mouth” in Japanese
Short answer
Big mouth in Japanese is “大口” (ookuchi). Full meaning: big mouth, mouth opened wide; boastful speech, tall talk, bragging, boasting; large amount, large quantity.
Other ways to say “Big mouth” in Japanese
巨口
kyokou big mouth
ビッグマウス
biggumausu big mouth
オオクチ
ookuchi big mouth, mouth opened wide; boastful speech, tall talk, bragging, boasting; large amount, large quantity
ホラ吹き
horafuki braggart, boaster, big talker, big mouth, blowhard, bullshitter
大ボラ吹き
ooborafuki braggart, boaster, big talker, big mouth, blowhard, bullshitter
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