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A loudmouth who can't shut up and always thinks they know everything. They show up uninvited, talk your ear off, and then act shocked when you don't pay for their drinks.
My cousin showed up at my birthday party and started telling me how to run my life. I still haven't forgiven him.
My neighbor came over and gave me a 10-minute lecture on how to fix my leaky faucet. I just let it drip.
My friend's kakker showed up at the restaurant and ordered three steaks for himself and then tried to split the bill evenly.