돌탱이 but this is a Korean word and has a meaning doesnt it?
Somebody who answered my question said that this was the word used in the drama.

haha....that is very interesting and funny word^^

thank u very much for this long informative explanation:) but I think I have found the word  I was looking for. Somebody who answered this question said that 돌탱이 was the expression used in the drama.
Thanks again, take care bye:)

I think,
Rockhead is 돌머리

rock is 단단한 but sb usually accent "ㄷ" to "ㄸ" and read this  "딴딴한".
but writing and read this " 단단한".

단단한 is correct but that I read this 딴딴한 is more convienience.
I think....
Sb more using dialect, the more read this "딴딴한".


but 단단한 is correct

and,,, rockhead translate 단단한 머리 = 돌머리
Rockhead's slang form is 돌대가리

대가리(= head) is slang
Becaus 대가리 point animal's head such as a cow's head
Some people who hear that their head are 대가리 are very angry.
  
I think that rockhead similar to stone head
do you know stone head?
I translate 돌머리 to stone-head in English
I think stone-head is Konglish;;;;;;kkkk

Rockhead man is very stupid and obstinate isn't it?




I hope helping to you......