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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.
by Anonymous_1992 April 21, 2016
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