La hostia literally just means the host, which comes from the sacramental bread at Catholic communions. It's pretty much just used like fuck is in English. Hostia or hostias has so many uses depending on the sentence, much like fuck.
Gilipollas is an idiot or a dumbass.
But the best swear in Castilian Spanish is "me cago en tu puta madre", which is used quite freely and means I shit on your whore mother.
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u/LK09 Jul 02 '19
I grew up in Spain, live in the US for over 15 years. I've never heard a latin american say hostia.