Originally Posted by
Thetyim
^^
The term anal-retentive (or anally retentive, anal retentive), commonly abbreviated to "anal", is used conversationally to describe a person with such attention to detail that the obsession becomes an annoyance to others, and can be carried out to the detriment of the anal-retentive person. The term derives from Freudian psychoanalysis.
Origins
In the psychology of Freud, the anal stage is said to follow the oral stage of infant/early-childhood development. This is a time when an infant's attention moves from oral stimulation to anal stimulation (usually the bowels but occasionally the bladder), usually synchronous with learning to control their excretory functions, a time of toilet training. Freud theorized that children who experience conflicts during this period of time may develop "anal" personality traits, namely those associated with a child's efforts at excretory control: orderliness, stubbornness, a compulsion for control, as well as a generalized interest in collecting, possessing, and retaining objects.