as useless as an ashtray on a motorbike
as useless as an ashtray on a motorbike
Utterly ineffectual, worthless, or unnecessary. Primarily heard in Australia. This umbrella is stuck inside out, so it's about as useless as an ashtray on a motorbike. I'm as useless as an ashtray on a motorbike when it comes to figuring out computer problems.
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