What does "Octotastic" mean?

Solution 1:

I believe this comes from the GitHub, a cloud based version control system. Their logo is the Octocat, and they often use the phrase "have an octotastic day".

Solution 2:

At MrHen's kind suggestion, I'm submitting my earlier comment as an answer...

It's very common in informal writing for authors to add "-tastic" to words to make them sound more effusive. So it's not that October is especially fantastic, but merely that you didn't happen to encounter an occurrence of "Maytastic" or "Junetastic" when their time rolled around. Having said that, I will admit that some months lend themselves to portmanteauing more readily than others. I doubt, for example, that you'll run into an occurrence of "Februtastic," even though February is a truly outstanding month.

As Jim notes in one of his comments above, the suffix "-rific" (borrowed from "terrific") has a similar tendency to appear as a would-be excitement enhancer in a multitude of settings, as in "lobsterrific" or "ennuirific." Yet another such suffix (somewhat less commonly used) is "-tacular" (borrowed from "spectacular").

Belated acknowledgment: It seems pretty clear to me now that, with regard to the question of where octastic comes from, Bryan's answer is the correct one. I'll keep my answer here live because I think it still has some value in connection with interpreting other words with suffixes like -tastic; but in the specific instance of octastic, Bryan undoubtedly has it right.