When you start eating in Japan, you say "いただきます" to show your appreciation. And when you are done eating, you say "ごちそうさまでした" Gochisou Sama Deshita. Or thank you for a delicious meal.
When you talk about god, you say 神様 "Kami Sama" to show your respect. But when it used as an adjective ... "Kami" means "Great". If someone did something great, you say 神業 "Kami Waza". If you respond really well, you say 神対応 "Kami Taiou".
まじ "Maji" is a word people to express their surprise.
I think the word Maji came from the word Majime (Serious) and got shortened.
Maji means "Really?" or "Are you kidding?"
You can answer by saying "Maji" too.
So the conversation can go like this.
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