umm...
...What does DDoSing mean?
Not DDoS, that's slightly different from what Kalar did. That's with multiple sources.
DoS means Denial of Service. It's an attack where you send a lot of data from one computer to another computer or server, which basically overloads it and crashes it.
Now, DDoS means Distributed Denial of Service. That's when you control multiple computers to send data to and overload servers. But Kalar just used DoS.