Referring to the level and quality of cleanliness of a surface. Pure mankiness is commonly observed in the hallways of a middle school, where children slide their sweaty hands across various bacteria-infested surfaces such as the gym-changeroom lockers, toilet bowls, and (most notably) the school phone, not to mention all while eating their cheese pizza they dropped on the floor a few minutes earlier.
1. Patti: Why aren't you eating your free hot-dog?
Jim: Have you seen the fund-raising kids who make them? They don't wash their manky hands before assembling.
2. After having sat in the schoolteacher's cupboard for two years, the remaining few gummy-bears at the bottom of their plastic tub had been thoroughly caressed by dozens of ninth-grade hands.