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Billie Eilish says Elon Musk 's a "bad guy" for not giving away his fortune to those in need ... and she used some spicy NSFW language in order to get her point across.

The singer-songwriter shared her raw thoughts about the tech billionaire ... reposting a series of ideas for how Elon could use his massive wealth to save the planet after a new Tesla pay package put him on track to becoming the world's first trillionaire . Instagram / @billieeilish

Eilish shares claims that Musk could end world hunger, save critically endangered species, or even rebuild all of Gaza with his money ... but instead, he chooses to hoard his wealth. Instagram / @billieeilish

Billie then editorializes a bit by calling out Elon specifically ... referring to him as "f***ing pa

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