Michelle Obama acknowledges the crowd at the Royal Festival Hall in London.
Perhaps Sandberg should take Obama's advice to heart and lean out for a bit.
Former First Lady Michelle Obama may have left the White House, but she continues to rack up magazine covers - and dole out candid personal reflections.
Upon hearing her utter a profanity, the packed 19,000-seat arena lost it, erupting in cheers and laughter. It's just that in this cultural moment knocking Sandberg's ideas is fairly kosher, even for a diplomat's diplomat like Obama.
Author and political commentator Toure Neblett tweeted that "everyone freaked out".
"The one challenge we have.is harnessing the power we do have and not relinquishing that and by that I mean voting", Obama, a graduate of Princeton University and Harvard Law School, told 300 rapt teenagers. "I go downstairs and open the cabinet in my own kitchen - which you don't do in the White House because there's always somebody there going, 'Let me get that".
And Obama announced yesterday that she was cutting short her European tour to return to the USA for the funeral of the former United States president George H.W. Bush on Wednesday.
Before her comments seemingly blasting Sandberg, Obama talked about the struggles of marriage and admonished young people for rushing into the commitment. But perhaps more shocking was how she deployed the curse word to denounce a feminist philosophy that has recently informed working women's outlook.
"Leaning in" was first popularized in 2013 by Sandberg, the now-embattled Facebook executive, in her book titled, "Lean In: Women, Work, and the Will to Lead". It encouraged women to supercharge their own careers by improving their negotiation tactics, striving to fill leadership roles at work, and taking control of their professional life.
During the revealing interview, the 54-year-old mom of two shares intimate insight into the early stages of her relationship with Barack, whom she describes in her book as, "a wind that threatened to unsettle everything".
The advice for women to "lean in" has been criticized before.