certified head doctor
Some bitch who is certified in giving head, dome, knowledge, cranium, brain, neck, throat, skull, noggin, mouth, face, head, hummer, knob, wisdom, etc.
Yo that girl right thurr is a certified head doctor fa shizzle because she sucked the whole crew and didn't even choke. Then she received her certification according to how we rated her on from 1-10. This could also be train-able material. See Train for more details.