Stupid, smelly, worthless, annoying. usually not up to Erin McDonnell's standards. Not worthy of her greatness. Someone who is jank is someone who doesn't respect someone, and usually is looking for a good ass beating. If you are jank, you should probably run away from Erin McDonnell, before she gets her trashcan.
"Dude, Tiffany is going out with Erin's ex-boyfriend.."
"Man, that bitch is Jank. She loves sloppy seconds".