ass-backwards

(colloquial, not comparable)Moving backwards, that is, rear end first.

arschlings

за́дом наперёдzádom naperjód, ра́комrákom

(colloquial, idiomatic, not comparable)In a hopelessly misguided manner; in a manner contrary to what is normal, expected, or logical.

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

ши́ворот-навы́воротšívorot-navývorot, че́рез жопуčérez žopu, ра́комrákom