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The regional term specific to Philadelphia, NY for the ring-shaped bread product more commonly known as a bagel. The usage of the term was popularized by Collegehumor.com.
I love a Jibbly John on the Half Shell with a shmear of cream cheese in the morning (Go Phillies!).

Give me a couple of those Jibbly Johns on the Half Shell (Go Phillies!).
by Jammich May 03, 2011