What does the internet slang "草生えた" mean?

I came across the term 草生えた on the internet. There wasn't much context, but it didn't seem to mean that grass was growing. Is this a slang term?

What does it mean? I couldn't find it in any of my dictionaries.

Answer

Thanks to @Chocolate, I was able to learn what this word means, which is roughly that something was funny. Here are a couple sources:

1. http://wikiwiki.jp/himoteplus/?%C1%F0%C0%B8%A4%A8%A4%BF


2. http://www.logsoku.com/r/livejupiter/1340676537/

Why does it mean something was funny? Well, as discussed in this question, strings of w (such as wwwwww) express laughter, like the English term "LOL". At some point, someone must have decided wwww looked like little blades of grass, so they came up with the expression 草生えた ("grew grass") to indirectly express the same thing.