I saw many Thai young people use the word “(ขอ)แก้บน”. Can you teach me its meaning? Do they use it as a slang word? 🤔

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Example,I want to pass the exam so I pray to god that if I pass I’ll give 100 roses to the god. And when I passed the exam as I wish, I have to bring 100 roses to the God.

I pray that if I pass I’ll give 100 roses to the god. = การบนบาน/การบน
I bring 100 roses to the god = (ขอ)แก้บน