Barbara, 68, admitted it was "horrific being judged by everybody" on Dancing with the Stars because she is normally the one judging others on Shark Tank. (As a Shark, she chooses whether to invest money in start-up businesses or struggling companies).
"It's so much better to be a judge and tell everybody they're terrible," Barbara said on GMA. "I thought I was fabulous, but nobody agreed with me."
"I don't like the results, but they are what they are," quipped Barbara, who received only 17 points for her tango with Keo on Monday night. "I'm used to coming in first... but I was first out!"
Barbara put all of her effort into Season 25 of Dancing with the Stars, saying she couldn't have done much more to stick around.
"No, not at all. Keo, he was teaching me and it was distracting because he's so goddamn delicious," Barbara joked, later adding that it was especially difficult to concentrate when Keo had a pool of sweat under his neck.
"I guess it's my fault!" Keo noted with a big laugh. "I tried to put my clothes on all the time."
"You try dancing with this guy and see how far you go," Barbara told GMA's co-hosts.
Kevin O'Leary, one of Barbara's co-stars on Shark Tank, then surprised her in the studio audience.
"What happened?! I was the only Shark who believed in you. I wanted you to go all the way. I was the one who bought you the new broom so you could get there on time every morning!" Kevin teased her. "Barbara, you were spectacular. I wish I could be there tonight to watch you. But, oh, you're not there anymore."
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Kevin was referring to Dancing with the Stars' upcoming September 26 episode at 9PM ET/PT on ABC in which the remaining 12 couples will perform a new routine for "Latin Night."
"Barbara, you did great," Kevin added, "and we're all supporting you -- for the next time... I'm going to get on Dancing with the Stars and kick your hiney."
During a separate interview with Us Weekly, Barbara gushed once again about Keo, whom she joked about being completely infatuated with on Dancing with the Stars.
"[I'll miss] all the dreams I've been having at night about Keo, honest to God," Barbara told the magazine.
"Oh, my God, waking up in the middle of the night, screaming his name. I don't know if that's going to keep him up!... I have to talk to my husband, Bill, of 24 years. If he'll step to the side, I'm definitely going to propose to Keo."
When looking back on her Dancing with the Stars stint, Barbara also said she's pleased to have shown a different side of herself than what viewers have come to learn about her by watching Shark Tank, a series known for being pretty cutthroat.
"I don't think fans realize that I'm really a soft touch, and I buy with my heart on that show," Barbara explained, "and I just fall in love with people very readily, and I trust my instinct, and that's why I'm good at [business]."