A old man, typically used in a stereotypical way of a cranky old man, that always yells at children to get off his driveway, porch or more commonly used, lawn.

when you're hungover as shit after a spending a night drunk as a skunk

Old man Jankins is 93 and will forever be 93, he goes to bus stops to watch children, and has a girlfriend who is 18. Old man jankins Is the ultimate pimp