partypooper 

One who breaks up or ruins a party through a variety of means. Possible ways of dispersing or destroying a party include but are not limited to: calling the authorities, stories involving octogenarian sexual intercourse, Jennifer Aniston movies.

Rich: Oh no, Larry! Here comes Harold.

Larry: He's probably going to come over here and talk about his wife. She just died. God, what a partypooper.

Rich: What a selfish bastard! What makes him think we care about that?

partypooper by The Master of Unlocking January 22, 2010

Partypooper 

The opposite of Partygoers in The Backrooms. Very friendly and are humanoid with jackets and a blue mask with a sad face. Resided in The Boredom Room but, after The Fun War, now live in The Promised Land

Man I wish The Partypoopers were still around

Partypooper by ThatAnonymousBloke April 6, 2022

Partypooper 

A partypooper is a entity that lives in level 777(I think)and are small numbered because of the fun war with partygoers

Oh a partypooper

Partypooper by Camthefurry October 4, 2022

party pooper 

A person who ruins a party by either stopping the fun or not participating in a certain activity.

Jeff is a party pooper because he won't play Spin The Bottle.

party pooper by Special July 18, 2004

party pooper 

A person that ruins a festive moment with their attitude.

Jan is such a party pooper, but we went on with out her!

party pooper by Runic Pride August 2, 2006

Party pooper 

Someone who’s looking out for you and making you sure you don’t get so drunk you blackout and wake up pregnant

“Omg stop being such a party pooper”
“Ight i’ll Stop helping you bitch”

Party pooper by Deletedthoughts January 30, 2020

Bloomington Party Pooper

Meet an attractive lady at a party. Take her to a private area. Fuck her in the ass hoping that some shit comes out on your dick. Wipe shit off cock with either hand. Then on the way back to the party gently stroke the back of her head depositing her own shit in her hair. Hope everyone sees this and she starts running away crying.

Hey Dan did you see that girl with shit in her hair at the party?? Some genius must have given her the old Bloomington Party Pooper. Yeah... It was me.

Bloomington Party Pooper by R.R. WMD October 19, 2007