Just a blurb

What is a blurb exactly?
Is it one single thought one sentence or one paragraph?
A blurb is what you make of it something that might be stand alone but is just as important as the rest of the connected thoughts in your brain.
Then again, is a thought ever really disconnected to another one?
I could keep going on like this forever.
So I think I will.
Actually...
What I meant to say in this blog is that this smiley : / is beggining to look happier and happier each time I type it.
How strange.