oral fixation [awr-uhl-fik-sey-shun]
1. Psychology. A desire to have or put something in one's mouth, as in infants; a condition requiring stimulation of the mouth
EX. Oral fixation is very common in human's for a number of reasons: first, and foremost, we are animals and eat/drink through our mouths. Secondly, we often attempt to use the mouth go grabbing functions in lieu of a third hand. Thirdly, Freud, the originator of the terminology would link such oral fixation to the suckling or oral phase of infancy. Then again, to quote Freud, "Sometimes a cigar is just a cigar."