Blend of word 'Comatose' and 'Chrome'. When the colors are so dense in artwork, GUI's or report chart, that you can no longer distinguish there difference between the elements - the thing you're looking at is a confusing colorful mess.
When solving Sudoku and using Basic Coloring, the act of overusing of different colored sets to the point where you become confused which set is which, that state of confusion is Chromatose. Virtually any AoE2 minimap with 8 or more players induces Chromatose. Staring at "No. 5, 1948" may induce Chromatose, especially when you think how much it is worth.