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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A meme originating from 4chan and soyjak.party around late 2021 used to deride another user by indicating that they're suicidal, e.g. that they were hung in the middle of typing their sentence. It immediately ends the quoted sentence, is often put in place of vowels near the end of a sentence for maximum onomatopoeification, and in addition it's almost always in greent-ACK!
Anonymous No.1: rope tranny you will never be a woman
Anonymous No.2: >rope tranny you will never be a wom-ACK!
by Travis God of eyelashes June 1, 2022
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Popularized by Berkely Breathed's disturbing cartoon character "Bill the Cat" of Bloom County fame (later became Outland). It is the product of the random misfirings of a braindead individual who wants to say something intelligent but seems completely devoid of any grey matter. It is frequently followed immediately by the word "thptptpt", which is produced by flatulations of either the lips or some other sphincter.

You may also hear this exclamation muttered by hung-over frat-brothers when they first wake up.

You might also hear this word from time to time in an overcrowded senior retirement center, with nobody noticing it is even being said.
"Ack! Thptptp! Ohhh man! groan, groan

...what am I doing here, and why am I wearing this inflatable duck?"
by Val Patrick December 24, 2004
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