A mixture of every single offensive word you can think of.
Most commonly used for males,this word was first used by teenagers online chatting,when they want to offend someone but cant think of a word that describes there hatred for the person and so just type "Poi"
Probably used cause i-o-p are close on the keyboard and so are easy to type to the word p-o-i in a moment of anger.
Girl - argh,my ex is being such a poi!
Boy - Whats a poi?
Girl - Urban Dictionary it.
Boy - argh ffs,my mate jack here has turned into such a poi.