Umseting - Japanskt-Enskt - please help

أريد ما تعنيه هذه العبارة بلهجة بريطانية
أريد المعنى أي المقصود وليس تكرارها نفسها الأمر عاجل من فضلكم

The man is quite ANGRY. Japanese people don't swear much, but the nuance here is:
"Do whatever the fuck you want, I don't give a shit. See you later."
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Notes:
Katte ni: without thinking about anyone else's feelings (not a good thing in Japan)
Shiro: a VERY strong command form of "do"
Ore: the MALE form of "I"
wa: Subject marker
itte: go and
kimasu: come (back)
sore ja: "well," (in this context, "seeya")