I see this a lot on Flickr or YouTube or blog entries talking about some creative project such as a short video, a drawing, some bit of photoshoppery, or the like. I hate it because it’s the equivalent of “too much free time”, only applied against one’s own self to deflect criticism. It’s a way to ask your audience to forgive this creative effort of yours if they dislike it; the only reason you did it was because you were bored.
But of course the creator wasn’t bored. He or she was playing with Photoshop or Legos or a webcam or whatever, indulging in creative play. And if this thing that was created was such a wasted effort, a mere doodle or so, then why put it on the internet for others to see? Because you’re proud of it. Or at least pleased with it. Or maybe you’d like some feedback on it. Say so. You’ve done something creative; show it off! Don’t shoot yourself in the foot and go, “I’m sorry, this suck, but forgive me; I was bored.” When I see that whole “I was bored” thing it instantly removes any amount of being impressed that I had before I saw that.
You’re not bored and you don’t have too much free time. You’re using the free time you have in a perfectly honorable way: trying to create something. Quit being ashamed of that.