I think I might be the origin of naice 
Having just asked my mum why MN say naice not nice, she has explained that someone found a shopping list that detailed "nice ham"... Cue hilarity.
Well. I've done that for about 20yrs. I'll write "bread" for standard cheapy sliced bread for sarnies, but then we like this big crusty loaf for mushrooms on toast for breakfast, and I'll write "nice bread" and know what that means.
DS likes that godawful thin sliced plastic ham stuff which I buy on a regular basis, which just goes on as "ham" but then when (now ex) DP would ask for ham, he'd mean thick cut off the bone stuff, and I'd write "nice ham" and know exactly what I meant.
Nice, just sort of means, nicer than the regular every day version. On my shopping lists anyway.
And I always forget them and leave them in trolleys and baskets.
Where was this shopping list found?! Is it even true or is she winding me up?
Sincerely
Potentially-the-butt-of-MN 😳