Original: 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.
Simplified: The words anal-retentive (or  anally retentive, anal retentive), often shortened to "anal", are used in everyday language to describe a person with such a lot of attention to detail that the obsession becomes annoying to other people.