Park Gypsies
Park Gypsies is the title given to a group of girls, usually high school age, who can't find a house to party at so they constantly get drunk in the forest, or park. They are all raging alcoholics and are know for their ability to show up at any drinking location without invitation or prior notice.
My open house was going great until the Park Gypsies showed up to scare off the hot girls and drink all our alcohol.