What does it mean when your tongue is black and has pink bumps on it is that a sign of something?

See your dentist: It is possible that you have what is called hairy tongue syndrome (which is benign) but only your dentist can tell you for sure.

Antibiotics: Antibiotics can change the bacteria in your mouth allowing this to happen. Consult with your dentist.

Medication?: Several medications could cause tongue darkening including bismuth (pepto bismol)... Also certain wines can darken the tongue to that extent as well...