Dialects and soaps

I’ve not heard the expression “fat egg” here in Yorkshire, but language continues to evolve, so perhaps this is now more of a thing.
I have heard of “good egg”, meaning someone is a good sort.

I don't watch Emmerdale, so can't help with 'fat egg'. Vera Duckworth in Corrie used to call Jack a 'crate egg', whatever that is, though. And as an aside, all of Gail Platt's children have different accents

I was brought upon Yorkshire and Fat Egg is not a Yorkshire phrase? Fat head is.

Are you sure you didn’t mishear and they said fat head ?

I watch Emmerdale but can’t say I took enough notice of what they said I watched them fighting though

I’m a Yorkshire girl too and never heard it before.

Not a soap watcher but I’m sure anyone preparing for prison would be using a much more “colourful” repertoire.
Words I guess ITV cannot use pre the watershed!

Doodledog

I don't watch Emmerdale, so can't help with 'fat egg'. Vera Duckworth in Corrie used to call Jack a 'crate egg', whatever that is, though. And as an aside, all of Gail Platt's children have different accents

crate egg probably means inferior. I imagine it refers to the imported eggs sold in the late 1950s that were considered inferior.

Rural accents are the worst, but most 'urban' folk don't notice!

I lived in Yorkshire for many years, but never heard fat egg, though I do wonder if fat head could sound like fat egg, with a dropped aitch, and a very soft d at the end?

I don't live in Yorkshire or anywhere near but "fat egg" does sound rather unlikely. As others suggest, perhaps it was "fat head"? The latter is a known expression across the UK, albeit not particularly common and rather out dated. It's the sort of thing you'd have seen in Billy Bunter I imagine.

In Lancashire have heard someone called a ‘crate egg’ and a ‘soft apeth’, we also had relatives from Skipton but they never used the term ‘fat egg’.