A slang term for the Glaceau companie's "Vitamin Water Zero Go-Go Mixed Berry" brand flavored water product. It is a zero calorie beverage flavored with stevia and the juice of mixed berries. It is fucking amazing. Glaceau is owned by the Coca Cola Corporation.
'Go Go Bananas' is a ferocious war cry hollered by noble warriors when running off to tackle a problem in a courageous and sometimes suicidal head-on manner.
It's best said in a badly faked American accent for extra hilarity.
Private: "Seargent, the tangos are multiplying and out numbering us 100 to 1, we need to act fast!"
Seargent: "We'll hit them with a head on charge, and tickle their bottoms!"