A very serious and painful sexually transmitted infection. Usually transmitted during unprotected sex with extremely bitchy women--a Harpy--the resulting STI can be somewhat distracting.
After 30 incubation days, teeny-tiny eggs in the genital area hatch, releasing a clutch of Greek harpies. These small, winged creatures will then become very territorial over the infection site, and will attack any possible partner.
The harpies will only calm down after a large meal, their appetite being satisfied.
Brandon: "How was last night?"
Aaron: "Awesome! I took Angelina out to a big, buffet dinner and we had sex after! High five!"
Brandon: "--Dude, Angelina's a Harpy."
Brandon: "Did you use a condom?!"
Aaron: "Nope, went au naturel."
Brandon: "She gave you the genital harpies, man!"