Buzzkill definitions

The definition of a buzzkill is a statement or action that ruins a good mood or feeling.

An example of a buzzkill is someone talking about their mother’s recent illness while out drinking at a club.

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Something or someone that spoils an otherwise enjoyable event.
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A person who attends a social event and occupies his or her time with other activities than those offered at the event.
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Origin of buzzkill

buzz +‎ kill