In the comedy, Aniston plays naughty-mouthed dentist who finds herself in a sexual addiction support group, reported People magazine.
"She's a hard one to let go of. I didn't get enough of her! It was too quick. It was just like a little In-N-Out Burger," she said.
Aniston, 45, who reunited three years later with co-stars Jason Bateman, Charlie Day, Jason Sudeikis and Jamie Foxx for the sequel, said she even found a certain comfort zone with her character's salty language.
"I find it extremely entertaining the way she speaks. I don't really think that to her she's saying anything inappropriate. For her it's describing the ingredients to a wonderful souffle, or 'What are we going to be doing this weekend?'," she added.