omigot is the proud aussie way of saying "oh my god" uber fast. anyone one who sees or hears the use of such a term is blown away, and knows that the user means business
"omigot, did you see that, i owned his eyeball!"
"..and then i awped him and he was like omigot!!"
Similar to OMG (Oh my god!), but ending with a fashionable "osh" to imply "Oh my gosh!", which isn't "Oh my god!", which is important, if importance was the issue. Which it's not.