Robbing the gurney
To date, screw or marry a person that is significantly older than one's self. This would be the opposite of robbing the cradle where you date someone younger. The gurney would be compared to the cradle in that people that are old or near death lie in a gurney.
Dude, did you meed Rob's new lady? He's only 25 but She's gotta be like, 48 years old! He's totally robbing the gurney on that one.