Hobosexual
One who becomes only aroused by the presence of a hobo. Can be either a woman or man, but can only be sexually attracted to a Hobo. Even if the Hobo is one dirty motherfucker, is missing a leg, and has scabies, a Hobosexual will still become aroused. 
"Hey, Jim just came out of the trash can."
"You mean he's a Hobosexual now?"
"Yes, what a fucking weirdo"