Thirsty or dry-mouthed and in need of a drink, possibly because a parrot has been massacred and the resulting feathers have landed in the mouth so a drink is required to restore moistness.
"Brew up cocker, I'm spittin' feathers here"
Describes the act of people refusing to take their turn in making the tea.
Pop the kettle on Cunty, I'm spittin' feathers. 28_F