This is Mr Slim, a “doodle made at school during a boring lesson” by the very talented Olimpia Zagnoli. Drawn! linked me to her web site, which linked me to her Flickr account, which is where I met Mr Slim.
If you like what she can produce during a boring class, check out some of her other stuff. Even if you don’t, you might still check out some of her other stuff, since she works in a variety of styles.