This is a joke: the robots.txt is a file on websites used to give instructions about their site to web crawlers.

Disallow: tells the robot that it should not visit those particular pages on a site. Or in this case, terminate those individuals.

This is probably a joke with a reference to Terminator, where T1000 and T800 are "killer" robots. So if those robots obey web standards, they should not kill Larry Page or Sergey Brin when they destroy Google.