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ACK city 

a nickname for the popular island vacation spot of Nantucket, Mass. It derives its name from the Federal Aviation Administration's 3 digit code for Nantucket's regional airport, "ACK".
Yo bro, I threw down at the beach then hit some bars in ACK city
ACK city by jackomacko21 August 20, 2010
Related Words
A term used to describe an awkward situation, especially in passing.
"I just saw that guy I hooked up with last night and we didn't acknowledge each other. It was so awkcity!!"

"I am a permanent resident of awkcity!"