Noun. From "Homeless showboat", an overly eager, attention seeking street individual with no discernible place of residence. Often known to play instruments/sing, juggle poorly, and engage in intentionally shocking acts for money and/or attention. While very popular in urban areas by visiting midwestern tourists, often vilified by locals and less ambitious members of the homeless community.
"Did you see that bum? He was trying to eat like, 14 bottlecaps? Fucking Hoboat."