noun
1. The body of mortal human Dipper Pines possessed by dream demon Bill Cipher.
2. A mortal human whose soul has been removed from their body; their conscious has become a ghost; and their body has been possessed by a bloodthirsty, pain-loving entity.
verb - Bippered
"Bill Dipper... Bipper!"
"Bipper stole the Journal and now he's going to burn it!"