Jennifer Aniston turned Conan x-rated on Thursday, Dec. 4 when she stopped by to talk about her role in Horrible Bosses 2.

The Friends alum was very nonchalant as she dropped the first expletive on the show, in response to a query from O'Brien about her jewelry choices for the role.

"Oh that's a c--k ring," she replied, explaining the necklace choice her character Dr. Julia Harris, a sex-crazed dentist, was wearing in the promo shot O'Brien had shown.

Mock-surprised at the audience's shocked response she continued, "It is a c--k ring."

"Was that your acting choice?" a perplexed O'Brien asked.

"It was an active choice," Aniston, who was dressed in a pretty strapless gray dress, replied. "It was one of those things where they lay out the jewelry, and I gravitated towards that beautiful piece of jewelry," she explained.

"I put it on and I was like, 'This is unique and cool.' And I kept on trying on other bits of her wardrobe and I just kept it," Justin Theroux's finacee added.

"They said 'Great, you chose the c--k ring'. And I was like, 'I'm sorry, come again?'"

At this point Aniston decided there was no point at all trying to keep her language in check.

Watch the whole, hilarious, expletive-filled conversation above! Watch Aniston's hilarious, most recent appearance on Kimmel here.