"baka" will suffice for "crazy" but is really more suited for "idiot", "imbecile", "dolt", "moron", "ignoramus" and the like.
However, I have heard the westernization of crazy as "kurae(zh)ee", phoneticized and in katakana. For example, 'honma ni, aitsu wa kuraezhee' (really, that guy is crazy!) in Osaka for example....
Please give me a hint on how to really get to my former marine hubby who spent time in Japan?
He always one ups me when we jab at each other kidding around. Could you tell me phonetically something that will let me win for once?