British English Slang - 'Dog's dinner' means 'a mess', something that's gone wrong, rather than 'dressed nicely'. There's also a common extension to the 'going to bed' phrase, where you say: "I'm climbing the wooden hill to Bedfordshire.
"American language vs the British language. People of Britain call items weird things compared to here in the United States. The creators of the ENGLISH language can call things whatever the fuck we want, thanks!