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A person who listens in on a conversation then butts in with their dumb opinion, usually because they think they’re cool and want everyone to notice them.
My cousin heard my mom and dad arguing and yelled, 'You should’ve just divorced her in the first place!'
At the coffee shop, the guy next to me listened to my friend and me talking about the best pizza place, then said, 'I’ve never heard of that place, but I swear it’s the worst.'
In class, Sarah was talking to her friend about the test, and Jake walked up and said, 'That’s easy. I aced it last year.'