A team of lip readers study the footage of the Labour leader and disagree with the politician's explanation of a Commons row.
He insisted he instead referred to "stupid people" in a comment about those "seeking to turn a debate about the national crisis facing our country into a pantomime".
But, amid a furious political row, lip-readers from 121 Captions have studied the footage of Mr Corbyn and disagreed with the politician's explanation.
She also explained how lip readers use a specific alphabet consisting of groups of homophenes - bits of words - that look and sound alike.
One of those groups are the three letters "P", "B" and "M", which all look the same. The letter "W" is not in that group but in another group together with "Q".
In addition, in the next homophene in "woman", the "M" is in the PBM group as well. The last homophene is N, which is in a homophene group with "T" and "D" as they all look alike.
Ms Lannin said: "P is in PBM group, therefore P can't be confused with W in 'woman'. At the end of 'people', you have the L. Completely different from the N in woman."