Showing up uninvited 

in internet parlance, meant to convey the appearance of an unwanted or undesirable group of people that you weren't seeking out in the first place.

There was an interesting discussion about how to save up for retirement, but then all these bitcoin bros started showing up uninvited.

Showing up uninvited by JuliusCesarus July 11, 2021

uninvited guests 

Any creature that chooses to make its home in a hard to reach area in your house. Be it in the attic, basement or inside a wall, these guests are often rodents, reptiles, or insects of varying sizes. Once discovered, uninvited guests are very hard to evict from your home.

I've placed some rat poison in the attic and sealed up any holes in the walls so we don't get any uninvited guests trying to make their homes here.

uninvited guests by Dan April 21, 2008

The Uninvited

It's the kind of horror movie you expect to be cool and scary, but then you look at the rating (PG-13) and watch it, and its not all that great. The acting is pretty bad, and the scenes were something pops out at you and the music is so choreographed its the equivalent of watching High-School Musical.

I went to watch The Uninvited, now I don't see why people go to movies anymore.

Guy 1: Dude, I watched this weird version of High school musical!

Guy 2: Dude, It wasn't High School musical, it was that movie the uninvited.

The Uninvited by MeNoGrammar February 15, 2009

uninvited guest 

another name used for an unexpected erection gained while in a difficult social situation

one might suffer an uninvited guest during class due to the female classmates attire (or lack thereof) and needs to concentrate on other non sexual feelings in order to calm 'the beast within'

uninvited guest by SoosterFly December 21, 2010

uninvited

when you want something you cant have

But you,your not allowed.Your uninvited.....an unfortunate...slight.

uninvited by Starlight April 17, 2003

Uninvited guest 

When a group of people enter a bathroom and consecutively defecate into the toilet without flushing. Best when done with a dry dock.

We all went over and left an uninvited guest at their house.

Uninvited guest by CharlieMacDeeNDennis January 13, 2009

uninvited driver 

Any driver on the road who is first at either a stop sign or a traffic signal, and when given the right of way, just sits and waits for either the road to be clear of all traffic before making the turn, or until another driver behind him "invites" him to make the turn by sounding the horn.

Cars are piling up behind that fucking uninvited driver!!

uninvited driver by DecemberTwentynine September 24, 2017