Someone who acts very pissed off and bitchy at a party, not wanting to drink, dance, or generally have fun. They will try to bring down the mood of the entire party with their debbie downer attitude. An extreme version of the party-pooper; most often girls who are pms-ing and/or who have hurt their shoulder.
Party-going friend: "Liz, you aren't a party pooper. You are a PARTY SHITTER"
Party shitter: "Guys, my shoulder hurts..."
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