U.S. Girls - Sed Knife lyrics

It's coming up On Tuesday You know it ain't hard To eat from my own plate It's kind of funny To look back on a life That you just cannot change This sedentary knife You know it cuts Straight in the line Between you and I This sedentary knife To walk around With no sound But still to hear what comes in Through those walls Someone's crying Just trying now to record The sound of their own voice But I know... That this sedentary knife You know it cuts Straight on the line Between you and I This sedentary knife It cuts Right on, that line Can you tell me why?