ass: 臀部，屁股 backwards: 向后，相反 ass backewards 搞错了，搞反了，颠倒

【例句】
You installed these windows ass backwards - the screens should be on the outside!
你把窗户安反了，玻璃应在外面。

It was ass backwards, to be blunt.
坦率地说，这是搞反了。