Wiktionary
arse about face
a. (context idiomatic British Australia NZ English) Placed or arranged the opposite way to the way it should be. adv. 1 (context UK Australia English) In a manner that is opposite to or the reverse of the way it should be, backwards. 2 In a confused or haphazard manner. alt. (context idiomatic British Australia NZ English) Placed or arranged the opposite way to the way it should be.
Usage examples of "arse about face".
Scientists always made such a big deal out of things and did it all arse about face.