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.
**.- Your mom is a true damn owl. She foreboded me a car crash... ahd guess what ?!!!
2 - Someone that lives the night life most of the time, an "owl"
guy2: nothing just owling around, i can't fall asleep.
2:Brian seems like he sleeps all day and lives it up all night, ahh what an owl!
lol -> lols -> lawls -> jowls -> owls
Person 2: Owls!