I don't give a damn; that's got nothing to do with me
Colloquial, dismissive expression used to show complete indifference or refusal to care about something. Often carries a defiant or confrontational tone.
I don't give a damn about that.
Like I care about your convenience.
Standard kanji spelling for this expression.
Variant using 事 instead of こと; less common but acceptable.
From 知る (to know) in the past tense + こと (thing) + か (question marker), literally 'Is it something I know?' or 'Do I know that?', used rhetorically to mean 'I don't care'.