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1.
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.
by Dan April 21, 2008
 
2.
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'
by SoosterFly December 21, 2010
 
3.
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.
by CharlieMacDeeNDennis September 26, 2008