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
Get the -ACK! mug.
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
Get the ack mug.
An Ack is a person with no common sense. An ack is usually a child with slight autism who acts as if they are more solid than the dicks that penetrate them. They also get extremely triggered on any game from Minecraft to Destiny, causing them to have breakdown and cry to their mother. Finally, they seem to have no control over their bowels and often shit themselves, causing every piece of clothing, not just underwear, to be covered in shit stains. In serious cases, an Ack will be unable to agree with anyone else causing everyone, even their own family, to know then as a little bitch.
Ack: OMG HOW DID YOU DO THAT YOU FAT WANKER

Bystander: what an Ack
by Legit Tings December 13, 2016
Get the Ack mug.
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
Get the ACK mug.
The one word in the language exposed to the world in Mars Attacks. Can also be used as the sweet sound of music - working particularly well with the Knight Rider theme tune.
Ack-Ack-Ack-Ack, Ack Ack Ack Ack, Ack-Ack Ack Ack Ack Aaaaaaaaack.
by When Dingoes Attack October 3, 2003
Get the Ack mug.
something that you wouldn't normally do and when you "ack" , your eyes get watery
Hey! I am so ack! I just did something that I would not normally do! And my eyes are watery!
by L.M.A.O News December 22, 2008
Get the ack mug.