Someone who is willing to marry someone even he or she is much younger than the other person is just because the other person has so much money and a lot of valuable expensive stuff.
Irene: Hey, did you hear about Sandy, who is 26 years old?
Jackie: Yeah, she just married some hideous old 83 year old guy just because he has a lot of money.
Irene: She's such a Gold Digger.
Jackie: As well as a total bitch.
Person 1: "Dude that person is a grade A air digger"
Person 2: "What do you mean"
Person 1: "Look at their hands it looks like they are masturbating two penis's at the same time"