What importance does an image have to hold to be in ones sig, or avatar? Just because it's there doesn't mean it's that great. Besides, it's not - look at the structure of your lines, you can tell they were scribbled in a few strokes. And it has no color, so I see where any confusion could come in that would make you work your ass off, unless ofcourse you were
drawing it with your ass which would explain it, fully. Either way I say it's spam, and there are my reasons why.
[EDIT]
It is useless, it will likely never be used, except as a tool to consume bandwidth. I already described why it was poor of quality and lacked any significance. So it is still spam
[/EDIT]