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Mack mack is like a dumb kid making up nonsense to act like they're smart. People use it when they're trying to shut someone up because they're being a pain in the butt.
"Mack mack!" he yelled, trying to drown out my loud rant about why cereal is the best food ever.
She said "mack mack" every time I talked about my pet goldfish.
He used "mack mack" to make me feel like I was wasting his time.