-anti air flak, term used in world war i.
ack-ack downed more planes than dogfights during the first world war.
2 more definitions
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…”
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.

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