Freudian psychosexual development holds it that if a child is not properly orally stimulated at a certain stage in their life, they will grow up to have certain compulsive behaviors, ranging from relatively harmless nailbiting to eventually harmful alcohol addiction.
I suggest you don't pay much attention to it; the latest research on that and other aspects of Freudian psychoanalysis is old and superseded by advancements in the understanding of human development.
I'll go so far as to say that Freudian psychoanalysis' value today is literary and historical, more the province of the imaginative than the clinically attentive.
But, on around some "kink" communites Oral Fixation has been kind of used for folks that have certain preferences for all kinds of sex involving mainly oral sex.
I put "kink" because it's not universal, and some folks think it's just a pretty vanilla preference and not part of "Kink".
This has reminded me that I've been down far too many niche internet rabbit holes and the normal casual internet people don't know these terms. Basically it means someone liking mouth related stuff like chewing on, biting, or sucking on things. It can be sexual but it can also just be pen chewing.
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I put "kink" because it's not universal, and some folks think it's just a pretty vanilla preference and not part of "Kink".