The trashy/fungus-infested women that surround athletes. The females are no more attractive than the fungus causing athlete's foot, and they seem to plague athletes like an actual infestation.
Jon: Hey Rob, why are all those hoes hanging out with that quarterback?
Rob: He's got Athlete's Smut. See how they cling to him like fungus? I bet that blonde has a yeast infection.
Jon: Gross. It's passover, too.