An acronym for the phrase "choke on two dicks". It is the action of putting your hands in the air in front of your mouth as if to pleasure two penises at once while simultaneously opening your mouth to catch the imaginary semen. It is generally performed after hearing about something unpleasant that you may have to do. This action is a way to display your displeasure in performing the particular task.
"Man I can't wait for that chmiestry exam!" *cotd*