'anally' originates from English, specifically from the word 'anal' with the adverbial suffix '-ly', where 'anal' meant 'relating to the anus'.

'anal' comes from the French word 'anal', which in turn comes from the Latin word 'analis', derived from 'anus' meaning 'ring' or 'anus'. The adverbial form 'anally' was created in modern English by adding '-ly'.

Initially, it meant 'in a manner relating to the anus', but over time it also gained the figurative meaning of 'in an overly meticulous or controlling way' in psychological contexts.