cat typing
n. The random keystrokes made by a cat as it walks across a computer keyboard.
Incidentally, "cat typing'' is also worth a mention. It refers to the prose produced by cats walking over computer keyboards and can be used in a derogatory fashion to describe a human effort.
—Beth Pearson, “The word on the street is a dog watching TV,” The Herald (Glasgow), May 03, 2003
1999 (earliest)
BitBoost Systems now offers software that will keep your cat from typing on your computer by "analyzing keypress timings and combinations to distinguish cat typing from human typing," blocking keyboard inputs and sounding an alarm to scare the cat away.
—Zay N. Smith, “Cat got your keyboard?,” Chicago Sun-Times, December 02, 1999