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A person who dislikes or refuses to participate in social events, often with the result of detracting from others' enjoyment of such events. Amy is such a party pooper. She thinks our company's social functions are stupid and just stands around pouting the whole time. Don't be a party pooper, come and talk to the rest of us!
n. the first person to leave a party; someone who ruins a party because of dullness or by leaving early. Don’t invite Martha. She’s such a party-pooper.