Etymology From Japanese 万歳(ばんざい) (banzai, “long live..., huzzah, hurrah”), from Middle Chinese 萬歲 (mjonᴴ sjwejᴴ), from Old Chinese 萬歲 (*mans s-qʷʰats, “10,000 years [of life]”, i.e. “immortality”), from 萬 /万 (wàn, “10,000”) 歲 /岁 (suì, “year (of age)”). Compare Mandarin 萬歲/万岁 (wànsùi).
1
Thrill-seeking; wild.
Still, the Seca II isn't meant to be a racebike, and power is adequate for all but the most banzai backroad blitzing.1991, Cycle World: Volume 30:
Etymology From Japanese 万歳(ばんざい) (banzai, “long live..., huzzah, hurrah”), from Middle Chinese 萬歲 (mjonᴴ sjwejᴴ), from Old Chinese 萬歲 (*mans s-qʷʰats, “10,000 years [of life]”, i.e. “immortality”), from 萬 /万 (wàn, “10,000”) 歲 /岁 (suì, “year (of age)”). Compare Mandarin 萬歲/万岁 (wànsùi).
1
A cry or cheer of enthusiasm, or to celebrate victory.
banzai
noun
Etymology From Japanese 万歳(ばんざい) (banzai, “long live..., huzzah, hurrah”), from Middle Chinese 萬歲 (mjonᴴ sjwejᴴ), from Old Chinese 萬歲 (*mans s-qʷʰats, “10,000 years [of life]”, i.e. “immortality”), from 萬 /万 (wàn, “10,000”) 歲 /岁 (suì, “year (of age)”). Compare Mandarin 萬歲/万岁 (wànsùi).
1
A cry or cheer of "banzai", to express enthusiasm or celebrate victory.
Etymology From Japanese 万歳(ばんざい) (banzai, “long live..., huzzah, hurrah”), from Middle Chinese 萬歲 (mjonᴴ sjwejᴴ), from Old Chinese 萬歲 (*mans s-qʷʰats, “10,000 years [of life]”, i.e. “immortality”), from 萬 /万 (wàn, “10,000”) 歲 /岁 (suì, “year (of age)”). Compare Mandarin 萬歲/万岁 (wànsùi).
1
Ambitransitive To carry out a banzai charge (against).