Corny ubscub Share definition Flag You are a corny ubscub if you have eaten potatoes within the last 2 months while simultaneously having a scab somewhere on your body. scott's mom has a scab on her arm and she just ate some potatoes. That bitch is a corny ubscub. Corny ubscub by Bobby bonkers June 19, 2009 Get the Corny ubscub mug.