Blank Pill

The meaning of being blank pilled is that you are completely oblivious to the pill ideology (Red Pill, Blue Pill, etc.), since you haven't been pilled by any pill's color yet. You either are undecided and can't make up your mind, or you might be too naive and/or stupid to be associated with any pill color.

Listen, dude, it's time for you to choose between the Red Pill and the Blue Pill. You've been Blank Pilled all this time. Time for you to choose!