It does mean duration of status. This means that you are permitted to remain in the U.S. for as long as you are maintaining your status. You are not maintaining your status - so you are removable (deportable). You also cannot apply for a change or extension of your status.
The fact that you are out of status, however, is a different issue from whether you are accuring unlawful presence. You only start to count unlawful presence when an immigration official or judge determines that you are out of status.
D/S means duration of status. So long as you are maintaining your status as a student, you are eligible to remain in the United States.
The law that prohibits return to the United States after a person has been here for over 180 days or over one year without status (known as the 3 or 10 year bar rule) is a different matter altogether. If you have immigration goals, I suggest you consult with a professional who will be able to help you.
This attorney is Board Certified, speaks Spanish and French, and represents clients throughout the United States. For more information, click through to the Blog or web site.
Elizabeth R. Blandon