What character can "□" [fei3] meaning 呕吐 be? I've got this entry from 《广安方言与民俗词典》which goes as follows:

□
fei3
指呕吐。例：他中午吃醉酒了，fei3了一地。

□ is as Wiktionary states:

Used as a placeholder for an unknown hanzi.

There's a good chance though that this character word does have an actual representational character.
I've not been able to find any MSM fei readings that mean to throw up/to barf, etc.
Notes: fei3 is equivalent to [fei⁵³] - so almost the same as fei4 in MSM.
Any ideas on what it can be?

My leaning at the moment is that fei3 is actually a contraction (合音) of something like 发呕 or 发哕 - not that I have any proof for it but it seems to be the most likely at the moment.
I'm thinking it could be a word similar to 淝 in Cantonese.

http://www.cantonese.sheik.co.uk/dictionary/characters/8979/


  淝
  fe4 fei4 jyutping
  fei2 pinyin
  [粵] fe4 - Cantonese only
  [1] [v] spray/sprinkle (water)
  [2] [v] shoot; gun down
  [粵] fei4 [國] fei2
  [n] name of a river in Anhui province, famous in Chinese history for Battle of Fei River (AD 383)


Examples of usage:
淝到周圍都係
淝啲成身濕