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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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
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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 8, 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 22, 2005
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acks (axe) vt., (from Ebonics: akin to ASK) 1. to use in words in seeking the answer to (a question); to try to find out by inquiring 2. to put a question to a (a person); inquire of -ackst, -acksin
Sistuh Woman: Hey, sup Cressida? Did you acks Tyronne if he got us the shit?
Cressida: Fuck that crazy nigguh.

Sistuh Woman: I'm through wit his narrow yellow no count ass anyway.
Cressida: Shit bitch. I'll acks him then.

Cressida: (to Tyronne) Yo muthah fuckah, you got me my shit or what?
Tyronne: Oh bitch, please...
by Ned Ludd August 2, 2005
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A sexual sound made by penguins when reaching orgasmic crescendo.
First penguin: Ack! Ack! Ack!
Second penguin: Got a light?
by Glub March 31, 2005
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