ass-backwards

listen to the pronunciation of ass-backwards
Englisch - Englisch
Moving backwards, that is, rear end first
Hopelessly misguided; having taken the utterly wrong choice

No wonder it doesn't work. The whole design is ass-backwards.

Oriented backwards, particularly after a mishap

The car spun out of control and I ended up ass-backwards in a ditch.

In a hopelessly misguided manner

They did the whole design ass-backwards. No wonder it doesn't work.

inside out; upside down; all wrong; mixed up