The 81-year-old firecracker appeared on "The Ellen DeGeneres Show" Tuesday with her equally fiery "Grace and Frankie" co-star, Lily Tomlin, to chat about their Netflix comedy series, which has already been picked up for a sixth season.
"So last season, you had a product that you -- that we can't talk about on the show -- but it's a very popular product, and..." Ellen said before Jane interrupted.
"Vibrator!" she blurted out. "You can say vibrator?"
"I...don't think we can," Ellen replied nervously. Within seconds, a shot from the show, showing the two ladies holding vibrators, appeared on the screen behind Ellen.
"I guess we can," she said, still quite nervous. By this point, there was no stopping Ms. Fonda.
"Especially for older women," she babbled, "because when the print is so small and you're old and you can't read... Plus, you see, Grace had never used a vibrator before, and our friend who died left us presents that she knew we could really use."
Cameras panned over to Ellen, who was sitting in silence -- her eyes bulging. The audience was in stitches.
But Jane kept going. "So she left me a vibrator, Grace, and I disappeared into my room, and when I came out, I had Carpal Tunnel Syndrome!" Now Ellen was cracking up, too.
"And!" Jane continued. "It was so good, that a real company tried to go into business with us. Right?" She nudged Lily, who nodded yes.
"What did they want to do?" Ellen asked.
"They wanted us to make a demonstration film," Lily replied. "I had to stop her from signing the contract."
"I wanted to do it, but she's so square," Jane added.