Why did Savannah Guthrie flip off Matt Lauer on camera in 2015?

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What did Matt Lauer do to Savannah Guhrie in 2015 that pissed her off so much that she flipped him off on camera? Remember this moment from March of 2015?

Why did Savannah Guthrie flip off Matt Lauer on camera in 2015?
Why did Savannah Guthrie flip off Matt Lauer on camera in 2015?

Did Lauer grope Guthrie off camera or something? Did he offer her one of his various sex toys? What did Matt Lauer do that would piss off Savannah Guthrie so much?