Its not internet slang. There is a fine line in slang and internet slang. Internet slang is slang terms you wouldn't use off the computer. Rofl. No one says that slang when having a conversation with friends. Do people say owns or rules when talking about something? Yes they do.
>>if you were to say "Zakk Wylde owns!", then what exactly does he possess?
That is also infering words. As to saying. Zakk Wylde totally owns at the guitar. If you where to put a definition in there it would be similar.
Zakk Wylde totally has control over that guitar.
Both mean that he is awsome at it.