Nuke

A person who just shows up uninvited to a gathering and destroys the vibe. Usually this happens in a public space in gatherings of 10 or less. Nukes can show up to house parties, but are usually disarmed by being told to leave. A nukes favourite place to destroy all life is in a park or at the beach, when chilling with a couple of friends. They will randomly appear usually asking for a cigarette or a beer, some will ask if they can join you and your friends, others will just sit in close proximity to your group and interrupt the conversation at their choosing

"We were hanging at the beach, drinking a few beers, then this nuke showed up.. so we all left"