Ah, sou ka. I guess 'Nani itten no ka wakaranai' would have been a nice substitute because it goes along the lines of 'I do not know what you are talking about.' or 'I do not understand you.'.
Happy New Year, Nihonjaki90! Many thanks for your service from all the previous years. We hope to receive your dedicated blessings this year too. Once again, many thanks. Btw, would you reupload this one please? 妹が僕を狙ってる