A man or woman of any sexual/affectional persuasion or preference who is rated as a disappointment within the realm of surrendering to the exigencies of physical love; a Bum fuck
"I thought that Darlene was as pretty as a bowl of tits," Sydney said, "but when we slipped between the sheets and finally got down to it, she turned out to be a hobosexual."
When one is sexually attracted to homelessmen and/or women. A word made up entirely by a sixteen year old girl named Molly, who is, herself, a hobosexual.
You: Heeeey, man, I seen a hobo lyin' on the streets yesterday, gettin' banged by some nasty lookin' chick.
Me: Yeah, that was me.
You: Ew, why'd you fuck a hobo?
Me: Duh, I'm hobosexual.