Funstipator 

Someone who stops the fun

He is a funstipator

Funstipator by I love Futbol July 5, 2017

Funstipation 

1. When an individual or group try as hard as possible to have fun, but inevitably fails.

2. When you want to have fun, but it's just not coming out. Kinda like poop.

Due to the major funstipation we were experiencing, we ended up at Denny's because that's all our crappy city has to offer.

Man, I'm so funstipated. It sucks.

Funstipation by Titty McGarglenuts October 7, 2009