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1.
1. When a group of (often dolled up) females congregate for a photo opportunity.
2. When a female engages excessively in the aforementioned behavior.
"Look at Sheila's timeline on Facebook... she's roostin' it in every single photo! Man! she must be really popular!"

"Sheila? She's kind of like a female version of a "bro." She's always roostin' it at Starbucks with the rest of the plastics..."
by Ammar Rai_ June 22, 2013