1. arse about face - Adjective
2. arse about face - Adverb
(slang, UK, Australia, New Zealand) Placed or arranged the opposite way to the way it should be.
No wonder it doesn't look right mate, you've got the whole thing arse about face.
(slang, UK, Australia, New Zealand) Arranged in a confused or haphazard way; muddled.
(slang, UK, Australia, New Zealand) In a manner that is opposite to or the reverse of the way it should be, backwards.
(slang, UK, Australia, New Zealand) In a confused or haphazard manner.
Source: en.wiktionary.org