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1.
(1) A co-worker who repeatedly angles his/her head over your shoulder to see your screen. (2) A busybody or eavesdropper. (3) An uninvited person who shows signs of curiousity in your private life.

Derived from the machinations of the bird on the television show "Bareta" who sat on Robert Blake's shoulder, the term is also intended to be less obvious to the "g.c." himself when he is being referenced.
"I can't talk right now. I got gay cocktoos all around me."
"Quit reading over my shoulder, yo! You're like a gay cocktoo!"
"Hang on. I got a gay cockatoo."
by Spider Goodlegs September 03, 2005