Pronunciation of "轧" in 富顺(县)? 《富顺方言》has an entry that reads:


  【轧】
  读音：ōā（连读）
  释义：碾压，轧扎。
  举例：1、小心车子轧斗人！
  2、有一道菜叫“轧海椒”，下饭安逸得板。


The thing that is confusing me is the:


  读音：ōā（连读）  


I've checked in the actual print edition of the book and actually it seems that the Kindle edition gives more information the book only prints:


  读音：oa（连读） 


without any diacritics.

What would ōā（连读） even sound like? It seems more likely to be a mistake than anything else. Any ideas on the pronunciation of "轧" in 富顺(县)?
A tentative hypothesis:

It seems like there is a 挖 vs 蛙 split, which the dictionary has tried to notate. There is some kind of difference between the /w/ of 挖 and /ʋ/ of 蛙.

The fortition of /w/ to [ʋ] is attested across all of northern Mandarin, and is particularly prevalent in Beijing and the Northeast. This dictionary seems to suggest that this process is incomplete.

I think that the pinyin orthography used by the book has "w" representing /ʋ/, and the "o" representing /w/ instead.

My evidence for this is 娃儿 being transcribed as "wáer (连读)" whilst still having 轧 as "ōā (连读)" in the dictionary.