Anthony Baxter wrote:

Jantzen, Günter wrote:

...

I am not a native speaker, so I don't understand the expression 'ass-backwards'. Seems not very polite to me.

It's just a slightly stronger way of saying "the wrong way". I'm Australian, and tend to use language like a blunt instrument. <wink> Apologies for any offense.

Blunt is better than overly polite. :-)