1.- Another term for (computer) hacker
Perhaps it comes from the tendency of both, hackers and owls to take advantage of darkness
2.- In South America, "owl" is said to a person who forebodes bad things (that become true) to other people.
*.-"night owls" was in the 90's one of the biggest cybergroup
**.- Your mom is a true damn owl. She foreboded me a car crash... ahd guess what ?!!!