"Red-blooded" means: 1) A person, full of energy, strength and is having great bodily or mental health. 2) Someone, who is sexually active. 3) A person, who behaves in a traditional way, which is considered typical of a particular kind of person. For example, 1) Jack looked at that girl, as any red-blooded {meaning 2} youngster would do. 2) I think that John Cena is a true red-blooded {meaning 1} full wrestler, who always performed with vigor and aplomb.