"acada god" means someone who consistently excels academically to an almost supernatural degree — the student who tops every exam, knows every answer, and seems to operate on a different intellectual level from their peers. It is one of many casual words teens pick up from friends, social media, music or sport, and on its own it carries no particular warning. If you hear your teen use it, it is fair to ask what they mean by it in their friend group, since meanings drift quickly. Asking out of curiosity rather than alarm tends to keep the conversation open and useful.