Space Invader
Noun · Slang & Abbreviations
Definitions
A visual element or component that appears where it does not belong and disrupts the layout. In engineering slang, it can also refer to a rogue process or feature creeping into the wrong domain.
In plain English: Something that intrudes into a place where it does not belong.
Example: "That debug banner was a total space invader on mobile, shoving the real content below the fold for no good reason."