Is this considered hacking?

Well, I visited a site where u could vote...
Then, in an eager to win, I kept pressing Enter, resulting in heavy traffic and the site becoming very slow...

Later, it was announced as a hacker attack...
But, I'm really curious if this is considered hacking at all :(
Coz I've been to a lot of sites which allows u to vote as much as u want & nothing happen...
Furthermore, the site allows users to vote unlimitedly... So... Is this considered hacking?

[vee_ess]

They probably just saw lots of traffic going back and forth between their server and the same IP address over and over and thought it was a DoS attack. A DoS attack involves using a server to the point where it stops responding to requests.