I found this sentence '제까짓 게 어쩌껬어', I know what 어쩌겠어 is but i can't figure out what it possibly means because there's not much example for '제까짓 게' and i couldn't find the meaning of that word
To just paraphrase it,
제까짓 게 means
someone(he/she) that the speaker is referring to in a condescending way.
제까짓 게 어쩌겠어 can be translated something like
What is he/she going to do(?) in a condescending manner. It is expected that he/she can't do anything about the speaker or situation caused by the speaker.
It could sound a little bit different depending on who says that phrase. If it was used by a speaker unrelated to causes of situation, it could sound more like
he/she can't do anything... in a helpless way.
To break down,
제here sounds like a dialect of he/she(could be plural) to me.
-까짓is an affix to
제in a condescending manner.
게is a shortened form of
It is not so often used in conversational Korean - sounds quite snobbish. I've only heard it from few dramatic scenes in K-drama and Korean literature...