Just some ideas.  Reblog and add your own!

The Tumblahs - Having nothing to post.

Tumbladder - A term used to describe the frequency of one’s posts.  (Example: “Jake posts all the time.  He has a small Tumbladder.”)

Tumblazed - Being stoned and browsing Tumblr.

Tumbummed - That disappointing moment when you realize you’ve read everything on your dashboard.

Tumbluff - Threatening to blog something, especially some juicy gossip or a controversial quote, and then not.