WTF Is OFD?

(I work at an ice cream/grill chain store in a small town. I’m training in a new cashier when one of our regulars comes in.)

Regular: “I want my usual.”

Trainee: “I’m sorry?”

Regular: “My usual. You know, with the OFD.”

Trainee: “The what?”

(He repeats the request a couple more times, getting ruder. I decide to intervene and introduce the trainee to our customer.)

Regular: “Oh! You mean you aren’t [Another Coworker]? I want the chicken basket with the OFD.”

(We have half a dozen combos that that could describe, so I ring the order in over the trainee’s shoulder. The customer gets the senior discount and sits in his usual spot without taking a number.)

Trainee: “What’s an OFD?”

Me: “Old fart’s discount.”