Literal Meaning

Ripe bananas which will not produce any juice: one still cuts grass for them - for use in the squeezing process

Implied Meaning

Even though something may not have an uncertain outcome, it still requires dedicated attention as the unexpected can always happen

Origin

A special type of banana called mbidde is used to make juice (omubisi), which is then processed into beer. Nobody can tell, in advance, how much juice will be produced: One has to simply follow the preparation steps and hope for the best outcome