Bloody hell — and also a hard hit.
As an exclamation, ¡hostia! or ¡hostias! means whoa or bloody hell. As a noun it is a blow: *se dio una hostia con la moto*, he crashed hard. *La hostia* can also mean the best or the worst, depending on tone entirely.
Literally the communion host. Catholic vocabulary turned into swearing is a deep Spanish tradition.
Blasphemous as well as crude, so it offends older and religious speakers more than *joder* does. Spain-only — elsewhere it just means the communion wafer.
Reading a definition isn't the same as saying it to someone. Lingo Kaiava is a voice tutor set to Spanish (Spain) Spanish — it uses hostia the way locals do, corrects you in the moment, and never "fixes" the way real people actually talk into textbook Spanish (Spain) Spanish.
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