b u z z k i l l (Noun.)
a person or thing that has a depressing or dispiriting effect.
Elain smiled, watching the alien grimace at the sharp taste. Everyone was given a second, larger than the last glass, for them all to sip on as they talked about their lives. The planet’s native gave it a disgusted look and let it sit on the floor in front of him untouched. Milo bopped her on her thigh closest to him and, when she took a look at her assistant, he nodded at the alien. “You brought a buzzkill to the party.” Her grin widened and shook her head at his childishness.