Mithering and mardy were two importantly different but equally undesirable description used by my Manchester mother-in-law.
If she was taken aback by something she'd say "Well, I'll go to the foot of our stairs!" But she made it clear she knew that getting a bit close to a Coronation Street cliché.
When I worked in Liverpool there were many great sayings. One was "She loves the bones of him." What a great use of English that is.
Another, which I still use, please excuse the vulgarity, is "He's pissed on his chips" meaning he's spoiled his chances.
And a Londoner I met once described a tinpot braggart as "very Billy-Big-Potaters" which I thought was great.