What character can "□" [fei3] meaning 呕吐 be?
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