In a manner relating to the anus, or in psychology, relating to Freud's anal stage of psychosexual development.
From Latin 'anus' (ring) + English adverbial suffix '-ly'. The anatomical term is straightforward; the psychological usage emerged from Freudian theory in the early 20th century.
In Freudian psychology, 'anally' describes personality traits allegedly formed during childhood potty-training, which is why psychologists still use this term—though modern psychology has largely moved beyond Freud's theory!
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