Pecker used that particular phrase when she was mad about something...
She learned it in context.
I remember when we were force feeding her Vitamin A foods, and she picked out every carrot from her dish and chucked it out of her cage, while swearing at me... it was actually pretty funny!
You could not take that bird off my shoulder. She was a velcro bird and a half. A friend of mine offered a finger, and told her to step up...
She looked at the finger, looked my friend up and down, looked at the finger again, and blurted out "F#@% you! in her loudest bird voice...
My friend said "excuse me?"
So, Pecker repeated the phrase, and then pushed her fingers away, and stuck her head in my eye socket...