Doing a rosie 

Saying you are doing something that you are not.

Ah shes doing a rosie again.

Doing a rosie by Yesboi88 January 7, 2020

Doing a Rosie 

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.

Doing a Rosie by Anonymous_1992 April 21, 2016

doing a rose

when you are taking up a whole seat for example, and won't move up to let somebody share it with you, much like rose on the titanic when she doesn't move up to let jack on the floating door, resulting in his death. BOOO ROSE!

(when someone is sprawled out, taking up loads of room on a couch,) "oh come on budge up a bit, don't do a rose!"
OR
i couldn't sleep last night because (insert name of person sharing a bed with) was doing a rose!

doing a rose by lethal grizzle aka hagrid May 3, 2010