when you disgusted by anything/anyone and want to spit on them because the are a disgrace to human kind
woah a fucking furry ACK!!!!!!!!!!!!!!!!!!!!!!!!!!!, woah someones tryna largamanoodle me ACK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!, someone doesn't have robux ACK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.
by Riley, Zac July 10, 2019

The laugh of DarksydePhil.
by Falchion315 April 22, 2019

by Martian Ambassador August 2, 2017

by syrianarab May 26, 2005

Noun: Stemming from the slang for "anti-aircraft" - A person who shoots another person's idea, thought, or feeling down.
Person 1: "How about Joe's Bar tonight?"
Person 2: "How about no?"
Person 1: "You, sir, are an Ack-ack..."
Person 2: "How about no?"
Person 1: "You, sir, are an Ack-ack..."
by DRoseMVP1235 May 26, 2011

by Longathon Eggbert September 6, 2018

Ack! is a meme spammed across 4chan boards, participially /tv/ and /pol/. The earliest known use of the meme was on September 8, 2021 by an anonymous user (who, in this case, was the OP of the thread) on /tv/. The thread depicted a GIF of a trans woman, who barely looked like a woman, hanging herself in hellfire. The description simply read “ACK!”. Variations of the meme include /pol/ack and yellow dog (who is meant to symbolize a mod).
ACK!
by Cosmic Lugger January 15, 2022
