There are many expressions of "stupidity" in Japanese, such as "red deer (ばかか)/idiot", "A Dai (ぁほぅ)/fool, idiot) and" ボケ/dementia, groggy.
In Tokyo, we often say "red deer", but the tone of saying "A Dai" is more serious. But in Osaka, the situation is just the opposite.
In terms of degree, "ボケ" was upgraded to "A Dai" and "ボケ" was upgraded to "クソボケ", and the result was stupid.
Besides these nouns, there are some verbs and adjectives that can be used to mean "stupid" ~ such as "line (ぃかれる/brain is abnormal)" and "こわれてし".
ぃかれた slave (abnormal brain)/guy.
このなぃめでててぃけ./You punk, get out!