It is a derogatory term used against people from the future. The term gooback came from the fact that when they travel thru the time portal a side affect causes them to be covered in goo, hence the term gooback.
A ball-shaped mass of oats, honey, granola, various cereals, sometimeschocolate, grahmcracker, and anything else that is tasty. Real gooballs contain ganja, though some people try to rip you off. Usual price, $5, sometimes 2 for 5. Really tasety
Goo-bae (goo-ba (silent e))
derived from the greek word 'goo' meaning mushed-up or messed-up. Commonly used to describe people with mental retardation problems. This word is very frequently used amongst wogs. Wogs are European settlers who settled in Australia. You are most likely going to hear the word if you go the Fountain Gate or Lygon street.