Saying you are doing something that you are not.
Ah shes doing a rosie again.
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Doing a Rosie - something being embarrassingly amusing, or amusingly embarrassing.
Comes from people believing Rosie to be a ditsy name.
Rosie: I fell out of bed last night and didn't realise.
Person: That sounds about right for a Rosie.
Rosie: What do you mean?
Person: Well it would make sense that a Rosie Did a Rosie
Rosie: What's Doing a Rosie?
Person: Doing something a Rosie would do, you know, something embarrassing or silly.
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