n. - a snowman made of snow that has collected dirt from the ground, giving it a dirty appearence like that of a hobo; a portmanteau of "snowman" and "hobo."
Jonny: "Hey Steve, check out this snowman
I just made. It's got a little dirt in it, but it's still pretty cool."
Steve: "Dude, that's a lot of dirt. That's no snowman, that's a snowbo."