Where did this phrase come from? My 5 year old relative busted that out on a Parrott this weekend and I wondered if it was hard wired [ 
]… I have no idea where he got that and neither did he. Failing finding where he got it I wondered …
Where did the phrase come from originally?
SDMB-GQ discussed it, sort of, 10 months ago and we got a reference that Polly has been a parrot name since 1616 … but nothing definitive on PWAC. Any ideas?
http://boards.straightdope.com/sdmb/showthread.php?t=190212&highlight=polly+cracker