What is meant when 'wonder' (عجبت) is used for Allah?

I've seen the word **wonder** used some times for Allah(swt) like in the below Hadith > Sahih Bukhari Hadith No. 3010 Narrated Abu Huraira(ra): The Prophet(pbuh) said, Allah(swt) wonders at those people who will enter Paradise in chains. also in a variation in Quran 37:12 Allah(swt) is given wonder attribute (بَلْ عَجِبْتُ وَيَسْخَرُونَ) I know that Allah's wonder is something that befits His majesty, but how can we explain it to a non-muslim?