"We do different things like go to Taco Bell drive thru," the country singer admitted during a SiriusXM Town Hall, hosted by Andy Cohen at Dollywood in Tennessee. "Carl and I have a little camper, a little RV, and we're always driving through fast-food restaurants to get our [dinner]."
"I'm not just endorsing Taco Bell," she added. "We go through all the restaurants."
Parton, 70, said she's often unrecognizable by fast-food workers.
"I wear my hair up in a little scrunchie," she said. "I don't look like I'm going onstage."
The country singer will even sign autographs when asked.
"I don't mind any of that but I really get mad if they mess up my order," she quipped.
And although Parton said she'll try out fine dining restaurants with friends, fast-food joints work best for the couple.
"It's hard for me to get [Carl] to dress up to go out to a nice dinner because he's just a country boy and he hates that stuff," she explained.
The couple will celebrate their 50th anniversary on May 30. Parton told People magazine that they plan to "get married again" to celebrate.