Snarky

From CaseyPedia

"From the ancient Greek, meaning butthead"

The complete context of the origin of the word comes from an episode from the fifth season of the television series "Homicide: Life On The Street" entitled 'Valentine's Day':

Detective Kellerman: You sure you want me with you?

Detective Bayliss: Yeah. Sure, why not?

Detective Kellerman: I don't know. The last time we worked together, you, uh, were kinda snarky.

Detective Bayliss: Snarky?

Detective Kellerman: Yeah. Snarky. You know, from the ancient Greek, meaning butthead.

http://en.wikiquote.org/wiki/Homicide:_Life_on_the_Street

In the context of the world of Casey Serin it is a popular blog post tag at Exurban Nation implying that Rob Dawg is in a humorous sarcastic mood.