Hi, the word in korean for crazy is 미치다(michida) the conjugation of that is 미쳤어요 (michyeoss-eoyo) 미쳤어 (michyeoss-eo - informal way) I am not sure if it's correct the spell of the pronunciation. ^^

yes! 미첬어!

If it is 삐졌어 or 삐쳤어, it means "I'm sulking".