The act of passing through objects, walls or terrain as if they are not present. Commonly seen in games as a cheating or debugging tool, see noclip mode
Different from Through Wall, where there is an explanation for the behavior (i.e. the subject may be a Ghost, there may be a hole in the wall), with Noclip the existence of the clipped-through object is entirely ignored.
Not to be confused with Glitch, which applies to visual artifacts, not the behavior of characters or objects.