Hello UD
whoops I think this may be my faux pas (again)

Here in the UK it is generally used as an expression to mean made a mistake or to have ruined something. i.e. I tried to mend the washer on my tap (faucett) and cocked it up so had to call a plumber. However it has to be said that it shows a distinct lack of breeding to use such an expression

With it's obvious connotations I very much doubt that you would ever hear such language from our own dear Queen! Now some of the minor Royals....(different story )

Best to you
Tony W