What does it mean when your hands and feet go bluish but not cold?

Can be circulation. This can be due to circulation difficulty, or it might be a symptom of hypothyroidism or vasculitis. There are vasospastic disorders, like raynaud's phenominon, that are triggered by cold exposure, with blanching, cyanosis, and redness, so the extremities must be kept warm. It would be a good idea to keep your feet warm anyway. It would be wise at this point to see your doctor and get tested.