Someone on a college campus who neither attends the college nor knows any one who does. Often implies a certain level of seediness as well as a general lack of propriety.
It's the sketchies that steal bikes on campus, not fellow college students.
A CRACK HOE THAT WALKS UP AND DOWN THE STREET IN SPANDEX TURNING TRICKS FOR A DOLLAR OR TWO. sHE ALSO LOOKS LIKE SHE HASN'T EATEN ENOUGH IN YEARS AND THE SPANDEX IS LOOSE.
OH GOD THE SKETCHIES ARE OUT AGAIN, I SAW HER GO INTO OLD DUDES HOUSE.PUT A BRA ON.