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Short for acknowledged. When a person says something that doesn't require a response, but the person wants to let them know they recieved the message. Similar to okay, but when using okay just won't do.
Sanford: I had cheerios for breakfast today.
Stephen: I don't care
Sanford: Ack
by JesusPirate July 06, 2010
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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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Nerdspeak for "yes" or "I hear you"
Usu. used on IM by programmers
"Is the latest patch on the source server?"
by mistervague November 08, 2003
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In the TCP protocol, the receiving computer sends an ACK (acknowledgment) to the sending computer. This is basically how a coonection is established.
Sender sends 3 packets, Receiver receives 3 packets and sends "ACK 4" (meaning it received what was sent, and it's ok to send the next number or packet)
by Obi-Wan December 09, 2003
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airport call letters for Nantucket Memorial Airport.

Common abreviation for anything Nantucket.
Ack Attack - Have to get to Nantucket for vacation
by Chris ACK June 07, 2005
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a human onomatopoeic(sound)word to describe frustration or disgust.
"ACK!!! I have work today, It's going to be a bitch!"
by Emily Winters January 05, 2005
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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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