After reassuring the crowd she was "back now", Obama offered a censored version of her earlier statement, swapping the swear word out for "stuff", Vanity Fair reported.
Speaking in London on Monday, the former First Lady said that the possibility of falling over at a public appearance is always on her mind.
Though Obama may have wished she had worded her response differently, the uproarious applause it solicited is likely not only a sign of approval because the former First Lady let loose.
"It is our responsibility to have hope, and act with hope and lead with hope", Obama told 300 teenage students.
She continued: "Overall, we are not seeing a major increase in female leadership in any industry or in any government in the world, and I think that's a shame".
'I share that with you because we all have doubts in our abilities, about our power and what that power is'. She spoke there about visiting Windsor Castle in 2016 together with her husband, who was the U.S. president then. As first lady, you're not alone much.
"The pressure you feel - from yourself and from others - can sometimes feel like a lot", she went on.
Obama recalled the challenges her husband faced before being elected president but did not dwell on life under the current president, Donald Trump, except to say that she is "hopeful". What do you need?' - and I made myself toast.
Elizabeth Garrett Anderson School executive head Jo Dibb spoke of her excitement ahead of today's visit.
Obama confessed to facing numerous hurdles and confronting teachers who "underestimated me at every step".
"That was my whole plan, you know, because I didn't believe that America was ready for a black President, let alone a black President named Barack Hussein Obama".
Only for him to reply "now that ought to shut you up;" and she admits it did!
On growing up in a working class family with not a lot of money, Mrs Obama said one of the most valuable things she was taught as a child was that her feelings were important.
The exclusive London event, in front of a crowd of around 2,700 people, is Ms Obama's only stop outside her 13-day United States roadshow.
In Becoming, Mrs Obama, 54, wrote: "I wasn't prepared fully prepared to feel what I did". But as I settled into a falling chair on stage and started watching the performance [.] something inside me began to quake.
"I'm back now", Obama said, smiling and looking a bit sheepish. As part of her visit, she took 40 or so of its pupils to Oxford University.