party crasher

noun — 2 senses

party crasher

noun
1

Derogatory, Slang Someone who attends a social event or party without being invited.

2

Broadly, Derogatory, Figuratively, Slang Someone or something who introduces negativity, chaos, or disruption into a situation.

Related terms
party-crashing

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.