What is Party Shitter?
1.
A person who completely ruins a party by stopping the fun or completely ruining the mood. Basically an extreme version of the Party Pooper.
"That cop totally broke up our party"
"Yeah...what a Party Shitter!"
See
2.
Someone who acts very pissed off and
Party-going friend: "Liz, you aren't a party pooper. You are a PARTY SHITTER"
Party shitter: "Guys, my shoulder hurts..."
See