When your to dramatic to say Oh My God Or OMG ( Or Oh My Gosh ) so you say Oh My Goi to spice things up. Usually a female would say this but males can also add this to their vocabulary.
" Oh My Goi. Did you see the new kid? He is so hot!
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A valley girl way to say, "Oh my god!"
"Oh My Goi Rachael, what did you do??"