The best replacement for oi is oy words.

The best alternatives to oi are rated as following:
★★★★★  oy words
★★★★  oy
★★  slank
★★  mcb
★  slankers
  oye
  astro file manager
  gvt

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Speaking about oi, one probably shouldn't forget about blue sclera.

Other search terms related to oi and their ratings are:
★★★★★ blue sclera
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oi
oy words
oy