The name means lover of the stars. They are generally curious and interested in what you have to say. With the nickname of Astro, they sure are rare to find. (Especially considering that this is the only definition at this moment)
Astro: "How's it going?"
Person: *Rants*
Astro: *Listens*
Person: "Wow, thank you astropel, you sure know how to listen to my problems."
A person you hate intensely not because they deserve such hatred but because they serve as a focus for your general hatred. A healthy way to dispense with excess animosity.
Jake's not really that big an asshole. He just serves as my hate sink.