The motto of NaBloPoMo ("National Blog posting month") is a nice example of dog latin. (Though in former times "blog or die" might have been dog-latined as "aut blogare aut mori", with some approximation to an infinitive form of the verb blog, more closely echoing the original "aut vincere aut mori" = "conquer or die".) No matter what the pseudo-Latin morphology might be, though, I don't agree with the sentiment, since I make it a principle not to blog unless it feels like fun. Life has enough necessities without adding another.
The alternative motto "Blog today -- tomorrow you may be eaten" is funnier but even less attractive. I'd go along with "Blog longa, vita brevis", especially if you add the rest of the quote.