an exclamation of shock, surprise, or disappointment to be used mainly by awkward individuals
"ACK! I left my wallet at home!"
by mylifeisawk February 22, 2012
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ACK is the call letters for Nantucket Airport, and thus ACK = Nantucket.
What does that "ACK" euro sticker mean? Nantucket.
by Fuzzwuzzy March 10, 2005
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The call letters for Nantucket Airport.

duh.
SON: Wow what do all those "ACK" bumper stickers mean?

DAD: Well son they are the call letters for Nantucket airport.

SON: Gee whiz dad! I wish I could be from Nantucket....

DAD: Don't we all son, don't we all- *sigh*
by Chain_Me_Free December 07, 2004
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the airport call signal for nantucket...like you know, JFK or LAX
Tourist: "excuse me, what does ACK stand for?"
Exasperated Native: "It's the god damn call signal for the airport!"
by ooer May 21, 2005
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Used to display displeasure of having to do something you don't want to do.

Ack! Was the sound Bill the Cat made when hacking up a furball, in the cult comic, Bloom County, which Berkley Brethead drew.
"Mike you have to lead the team meeting today."
ACK!
by WTPooh November 30, 2017
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The basic blocks of the Martian language from Mars Attacks.
"ACK ACK ACK, ACK! ACK ACK ACK ACK! ACK." - Martian Ambassador
by Martian Ambassador August 01, 2017
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