ACK

an exclamation of shock, surprise, or disappointment to be used mainly by awkward individuals

"ACK! I left my wallet at home!"

by mylifeisawk February 23, 2012

ACK

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

ACK

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

ACK

Something you say like a funny noise in a text, or in real life when you are acting retarded.

*commits die* ACK ACK AKK ACK ACK

by Ihatmylife October 10, 2019

ACK

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 08, 2004

ACK

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 22, 2005

ACK

Short for "acknowledged". Used in written speech to quickly let the other person know you received their message.

Inspired by the ACK packet of TCP protocol.

A: I just published the article.
B: ACK!

by goodhoko June 14, 2022