UNCLE RICO
A person who loves living in the past. The persons constantly talking about a sport they used to play and brag about how they were the greatest at it and that they could have been the best at it if they would of overcame a certain obstacle (Like breaking a bone or that they were held back by someone etc.) It's also a reference to Uncle Rico from Napoleon Dynamite
Example:
Brad: Man I could have been a top NFL prospect if I would have worked on my game more back in the day
Tim: Dude shut up you're being such an UNCLE RICO
Brad: Man I could have been a top NFL prospect if I would have worked on my game more back in the day
Tim: Dude shut up you're being such an UNCLE RICO