Oral fixation

[Sarah]

A psychological condition in which a person is unconsciously obsessed with the mouth and feels the need to always be sucking or chewing something. May lead to overweightness, nail-biting and other habits, and excessive cock-gobbling.

[Rihanna]

A term used for someone who constantly sucks, chews, bites, or knaws on object either do to practice for there nightly routine or to think.