a green banana


Senior Member
Chuck snapped the book closed. ‘There. Last one in the pool’s a green banana.’
Source: The Dead Zone by Stephen King
Context: Johnny is Chuck’s reading private teacher. They are having a lesson next to the swimming pool.

What does the idiom a green banana mean? a loser?

Thank you.
  • Language Hound

    Senior Member
    American English
    It's not really an idiom. A green banana is just an unripe banana.
    As kids, often before racing somewhere (to the car, to the pool, etc.), we would say "Last one in is a rotten egg."
    Clearly, the last one is the one who loses the race or contest and is therefore categorized as something undesirable, like
    a rotten egg or a green (unripe) banana.
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