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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..."
ack-ack by DRoseMVP1235 May 26, 2011
Related Words
When an individual experiences an anal prolapse, and another proceeds to choke on it.
Ack ack by Longathon Eggbert September 6, 2018
inconspicuous nickname for marijuana, esp. when used with parents/police present. Can also be used as a verb (See example below)
N.)- Yo lets go get some of that dank ack ack from that kid down the street.
V.)- Im gonna go take a cruise and ack it up if you wanna come.
Ack Ack by ThaStonedGecko January 28, 2007
Wanna try this bagel with pickles and farts

- ew no way that’s “ack ack”

ack ack ack 

WHAT THE FUCK?! HOW DID I DIE?! ACK ACK ACK!!!
ack ack ack by Falchion315 April 22, 2019

ack ack ack 

The basic blocks of the Martian language from Mars Attacks.
"ACK ACK ACK, ACK! ACK ACK ACK ACK! ACK." - Martian Ambassador