Based on the term "salt of the earth", a salt daddy is an older man dating a woman much younger (age gap ~10 years or greater), who has an annual gross income of less than $150k/year.
She is so much younger than him. Lauren is definitely not dating Brian for his money; must be her salt daddy.
A sugar daddy who lost all his money to gambling, resulting in the sugar baby having to work in the food service industry to help pay the bills and becoming salty about life
Ex 1: “Jess has a salt daddy, that’s why she works at McDonald’s now”
Ex 2: “Wow, I thought he would be a sugar daddy, but he’s a salt daddy. My parentswill be so disappointed.”
Ex 3: “Oh, he’s one of them salt daddies, I can tell by the desperation in his sugar baby’s eyes.”