Since it's going around as a meme, I'll play. The meme is named after this xkcd strip, in which the Saturn 5 rocket is described using only the thousand most commonly used words in the English Language.
Describe your job using only the ten hundred most common words:
In my day job, I write stuff to get people to give us money to make things that aren't, yet, but that could be, maybe. In my second job, I write stuff about things that aren't because it's fun, and people pay me so they can have the fun of reading what I wrote.
Want to try it? This text editor will automatically let you know if you've used a word outside the ten hundred allowed.