Verb: To move so far beyond the boundaries of a map so that there are no longer any objects or terrain within the draw distance, leaving one stranded in a blank plain. Most commonly a result of falling off the edge of the map in poorly-coded Unity games.
Roughly half of Gaming Garbage's videos end in ploishing.
Ploishing occurs when an object or character model inside a video game goes past the boundaries set up by the programmers, and hurdles endlessly into a void. Glitches and bad level geometry are the most likely factors to cause an entity to ploish.
Player 1: Don't try to jump over that wall in the corner.
Player 2: Did you get over it?
*Cut to Player 1's character falling underneath the world*
Player 1: Yeah, but I ploished when I tried it.