A guy who may or may not be a father and tries to dress all cool when he's not at the office-typically they appear on Saturdays. Usually unintentional pants that are too short, acid wash, mandals, dockers, loafers, etc...sometimes members only jackets.
He's so Saturday Dad (in reference to a man wearing a bad outfit that he clearly thinks is cool).
I'd date him, but he's too Saturday Dad for me. (again in reference to a guy who thinks he's hip and cool wearing a bad outfit).