The words Hiello and Hello may seem the same but they are, in fact, quite different. Hiello is a variation of Memphis, Tennessee dialect used by African Americans. It is used to express excitement or happiness in a lighthearted way. Hello is a more formal greeting and is used mostly just as an exclamation of greeting.
So while these two words may sound the same, their messages and the connotations they carry with them are quite different. Hiello is typically used to express joy and is often used conversationally, whereas hello is a more customary and polite way to greet someone.
Grammatically speaking, Hiello and Hello can be used interchangeably, but it is important to remember that using Hiello can often be seen as more casual and informal. All in all, both words are acceptable and can be used at any time, whether socially or formally.