Sourdough Starter Hooch

See that grey-ish liquid on the top of my starter?  This is what they call hooch. 

I'd heard of it, but never had it on my culture before.  When I took my jars out of the fridge (earlier this week) after a long slumber, the hooch was thick.  I dumped it out, then got started on the feedings.  As I mentioned earlier this week, the culture snapped right back to life.