What the heck is ICLW?

I'm seeing it all over other people's blogs and I tried to figure it out via Stirrup Queens' explanation but I must be a total moron.  Still don't get it.  Can someone break it down to a 1st grade level please?

Random tidbits:
- Bought our dishwasher last night and got a kick-ass deal on it to boot.  Gawd I love it when I find a closeout model, it just makes my day!

- Have this feeling that I'm getting sick.  Can't tell if it's a cold or allergies but we're going to the Depeche Mode concert tomorrow so I'm loading up on zinc.  *blech*

- Starting to get a little bit nervous because our caseworker left Adoption Options as of last Monday and we haven't heard who we get next.  I know it's probably because we're sooooo far down on the list but it's still making me antsy.