The Makeout Hobo is a character who appeared in Strip 594. He lives in his van and travels around the country making out with women, hence the name. He also offers philosophical advice upon request, though it may just be an excuse to invite listeners into his van.
Dora once came to him for advice at an early stage of her relationship with Marten.
Jeph claims that the Makeout Hobo is a real person who crashed on his couch for a couple of weeks.