I keep hearing:
- zuang [tsuaŋ]
- luang [Ĩuaŋ]
for 这么 and 那么, respectively.
I believe it is Minjiang dialect (岷江话, 岷江小片).
I've flipped through a couple of books I have but I haven't been able to find anything to corroborate what I'm hearing.
There is documented evidence for both zang and lang but none for the added [u] sound.
I'd be interested to find anything that documents z(h)uang and/or luang (maybe even nuang) from any dialect or language.