ass-backwards

/AE1 S B AE0 K W ER0 D Z/
adjective
  1. 1

    Oriented backwards, particularly after a mishap.

    โ€œThe car spun out of control and I ended up ass-backwards in a ditch.โ€

  2. 2

    Hopelessly misguided; contrary to what is normal, expected, or logical; having taken the utterly wrong choice.

    โ€œNo wonder it doesn't work. The whole design is ass-backwards.โ€

adverb
  1. 1

    Moving backwards, that is, rear end first.

  2. 2

    In a hopelessly misguided manner; in a manner contrary to what is normal, expected, or logical.

    โ€œThey did the whole design ass-backwards. No wonder it doesn't work.โ€

Source: https://en.wiktionary.org/wiki/ass-backwards